Champions League reaction

1. Arsenal & Chelsea through to last 16
2. Giroud's first Arsenal hat-trick
3. FT: Chelsea 2-0 Porto
4. Marcano own goal, Willian strike
5. Round of 16 draw on Monday 14 Dec

Three English teams in the hat for last 16 draw, which takes place on Monday at 11:00 GMT.

That's all from us tonight, but we'll back on Thursday for some Europa League action. Fun times.

See you later.

Don't let the lack of a smile in this picture fool you, Mesut Ozil is absolutely buzzing after tonight's win. That's his second tweet containing the word 'Ya' in about 10 minutes.

Manager reaction

Arsene Wenger on 16 successive years of reaching the knockout stages: "I'm proud of consistency because it demands a lot of effort everyday and I think that's what it's about. We escaped, maybe it's a lucky tear for us in the Champions League.

"If you look at the players who were out today and the kind of performance we produced, the performance is absolutely outstanding."

Pounds and progress

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The last time Arsenal missed the knockout stages of the Champions League was 1999. It was the year the British minimum wage of £3.60 an hour was brought in.

Arsenal have now reached the last 16 in each of the last 16 years. There's probably some readers of this page who were not alive the last time Arsenal failed to progress.

Roma's lucky progress?

Uefa.com reporter Paul Saffer highlights the way Roma sneaked through to the last 16. They placed second to Barcelona in Group E.

Giroud's got his ball

Manager reaction

Arsenal manager Arsene Wenger speaks in his news conference: "In the last three weeks we lost Coquelin, Cazorla and Sanchez. With all the other injuries not many people gave us a chance. But we are a real team and you could see that today. To score without conceding a goal is not easy. It is a special night for us. We needed something special and when you can deliver that you can create a positive memory for the rest of the season.

"Maybe it is a lucky year for us in the Champions League, you never know."

Vote result

To top off a pretty good night for Arsene Wenger, he's also come out on top of our vote, with 84% of you saying he will last longer in his current job than Jose Mourinho.

Wenger thinks this might be Arsenal's lucky year in the Champions League. Here's a bit more from the Gunners boss...

Ozil over the moon

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Manager reaction

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Arsenal manager Arsene Wenger: "I told you before that it would be the greatest escape. I must say I'm very proud of the team as we had to be right on the mental and tactical side. At 2-0 we had to push for a third goal, it was too dangerous to stay at 2-0."

On coming back in the group: "Nine times out of 10 you are out. We needed something special to come back like we did and tonight we needed a complete team performance. This team really is a team and they showed it again.

"You don't need to single Giroud out tonight because he scored the goals. But he showed character again with the penalty."

Player reaction

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Arsenal's hat-trick hero Olivier Giroud reacts on BT Sport: "It's fantastic for me and for the team. We are really pleased. It's nice to go through because we were not in a good position and finally we have done it. We feel relieved tonight.

"In the Champions League it's one level up and we need to be all focused. As a unit, together, good cohesion, defending well and finishing well. It's nice for us. It was not so easy in this stadium with this atmosphere and we are really pleased to have done it. 

"We want to go as far as we can. The target is to maybe reach at least the quarter final. It's the fourth year I'm here and we have never played a quarter final. We will have a good rest and open the new page of the Champions League in February."

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Arsenal's 'perfect game'

Arsene Wenger is talking to BT Sport now, and he says Arsenal played "the perfect game". Hard to argue with that. 

More from the Gunners boss coming up shortly.

Player reaction

AP

Chelsea skipper John Terry: "With our league form being as it is, the fans needed this performance and the players needed it. We gave a big performance, we're delighted.

"In the league I think we have lacked a bit of confidence but not in the Champions League. We have been fluent and dangerous and we saw that again tonight. Now we go to Leicester on Monday, which will be difficult, but we need to try and replicate this performance."

On Monday's last-16 draw: "We're delighted and lot of team will be fearing us. We will see what comes our way. If we can continue form like that this then it can be a springboard."

Manager reaction

Chelsea manager Jose Mourinho, speaking to BT Sport: "The players were really committed to get a result, as much for their pride. They didn't want to go to the Europa League and especially after the last defeat at home, a second successive defeat would have been an attack to their pride.

"They were compact and always had initiative, they tried to win even when the draw would have been enough. They deserved to win.

"We are not lucky in the Premier League. Luck is part of the game. In the Premier League every detail goes against us and it was a little attack to the players' confidence. It was an important result for the players and the clubs. 

"The supporters are unbelievable in their support towards me and I feel sorry I cannot give them more than I am giving them."

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Who could Arsenal and Chelsea face?

We know who is through, but who could Arsenal and Chelsea get in Monday's last 16 draw?

Having qualified second in their group, Arsenal could find themselves facing one of Real Madrid, Atletico Madrid, Barcelona, Wolfsburg or Zenit.

Chelsea, meanwhile, have the prospect of a potentially easier last 16 tie, with PSG, PSV, Juventus, Roma, Benfica or Gent their possible opponents.

Joel Campbell gets Lawro's vote

Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live

Reuters

"When people talk about why do managers let players go like Campbell has been let go a few times it's because at a football club, managers see these players day in day out and they see what we don't.

"They've probably stopped looking at him as a weak link now. You see a young player coming into a team and you are not too sure, you think 'should I give him the ball or not?' 

"I do believe after tonight he should go on to become a better player because of the experience."

Who's through to the last 16?

Group winners: Real Madrid, Wolfsburg, Atleico Madrid, Man City, Barcelona, Bayern Munich, Chelsea, Zenit

Group runners-up: PSG, PSV, Benfica, Juventus, Roma, Arsenal, Dynamo Kiev, Gent.

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No celebrations for Neville

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Not the night Gary Neville dreamed of, a 2-0 defeat on his managerial bow sees Valencia knocked out and Gent progress courtesy of their win over Zenit, who also go through.

Bayer Leverkusen drew 1-1 with Barcelona, that means they are out. Roma's 0-0 draw with BATE Borisov enough to keep the Italian side second in that group. They progress with just six points.

Porto are out, defeat at Chelsea did for them as Dynamo Kiev's win over Maccabi Tel Aviv sees them leapfrog the Portuguese side into second.

Arsenal into last-16

A turning point for Arsenal?

Arsenal into last-16

A great night for English teams in Europe, with Chelsea and Arsenal recording convincing wins. Arsenal's was particularly impressive as they weathered an early storm before superbly dismantling Olympiakos. 

It was deafening in the Stadio Georgios Karaiskaki at kick-off but almost silent at full time.

They sing his name

Reuters

Jose Mourinho's name is chanted by the fans at Stamford Bridge as Chelsea progress with an ultimately comfortable win. 

The Blues progress as Group G winners, with Dynamo Kiev going through as runners-up after edging Maccabi Tel Aviv 1-0.

'Outstanding Arsenal'

Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live

"A lot of the Olympiakos fans in fairness have applauded the performance from Arsenal. It was a 'Plan A' performance. Get the goal, settle the nerves, go again and quite honestly they have won very comfortably. 

"Beforehand it looked like an enormous achievement but they have all be outstanding. Yet another year in the Champions League final stages."

FULL-TIME

Reuters

CHELSEA ARE INTO THE CHAMPIONS LEAGUE LAST 16 AS GROUP G WINNERS.

A last chance for a consolation for Porto as Yacine Brahimi curls an effort just wide.

FULL-TIME

Reuters

ARSENAL ARE INTO THE CHAMPIONS LEAGUE LAST 16

Three minutes of added time at Chelsea as Loic Remy comes on for a stretch of the legs, replacing Eden Hazard. Jose Mourinho's side are minutes away from having their status as group winners confirmed.

Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live

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"Giroud's first goal was the most important. It gave Arsenal belief and they have been in control since."

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Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live

"Well done Joel Campbell. Started on one wing, changing to the other. Very good. Very, very good."

SUBSTITUTION

Reuters

The 90 minutes are up and four minutes of added time are shown on the fourth official's board. Alex Oxlade-Chamberlain comes on for Joel Campbell, who is gets a big cheer from the away fans for his efforts. Olivier Giroud also goes off, Calum Chambers replacing the hat-trick man.

Ian Dennis

BBC Radio 5 live senior football reporter at Stamford Bridge

"A shake of the hands for Diego Costa from Jose Mourinho as he comes off. Costa led the line well. It was his initial shot which led to the opening own goal. Chelsea going through as group winners."

You can listen to reaction from Stamford Bridge and Athens on BBC Radio 5 live now. Click 'live coverage' at the top of this page.

SUBSTITUTION

No goals for Diego Costa tonight, but he has led the line well and has put in a cracking shift. 

Chelsea fans show their appreciation for the striker when he is subbed off, giving him a standing ovation as he is replaced by John Obi Mikel for the final five minutes.

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There was a lot of unhappy callers on the football social last night.

I suspect there will be a lot of happy people tonight....

Give us a call on 0550 909693 or tweet @5liveSport or text 85058.

Options, options. 

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Rex Features

Giroud's special night

Which players have got Champions League hat-tricks in an Arsenal shirt?

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What company Olivier Giroud joins. Thierry Henry, Danny Welbeck and err... Nicklas Bendtner.

HITS THE WOODWORK

Eden Hazard slams a shot against the foot of the post as Chelsea attack again. Porto, at the moment, are dropping into the Europa League, but any last-minute drama looks a million miles away with their players seemingly desperate for the final whistle.

Oscar goes off to a standing ovation and is given a hug and a handshake by Jose Mourinho. A rare good night for the Blues.

Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live

"He looks like he's come of age tonight Joel Campbell."

Valencia heading out

John Bennett

BBC World Service in Valencia

Getty Images

"It's turning not a horrible night for Gary Neville, Alexandre Lacazette runs clear to score, totally against the run of play."

Ten mins to go

Olivier Giroud will grab the headlines, but Joel Campbell has been superb tonight, some great runs and touches. His part in Arsenal's second was a particular highlight.

Into the final 10 minutes...

SUBSTITUTION

Fifteen minutes to go and Theo Walcott's work is done. He is brought off, with Kieran Gibbs coming on as Olympiakos fans start heading towards the exits.

Another chance for Chelsea, and it is a cheeky effort from Oscar. He attempts to backheel the ball into the net from Willian's pass but Iker Casillas sticks out a boot to deny him.

Elsewhere in Europe

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It would take something absolutely amazing for Chelsea not to go through to the last 16, with Porto needing three goals.

Jose Mourinho's side want a big win, though, and Diego Costa has the chance to add a third as he surges forward. He is bundled off the ball just outside the area and looks up for a free-kick, nothing given. Costa slams the ground in frustration.

Neville's hope...

Some hope for Gary Neville as Gent have been pegged back by Zenit - it's 1-1. That means if Valencia can come from behind to beat Lyon, they'll progress. A tall order but maybe a fairytale start?  

Spanish football writer Mike Holden: "Noise erupts around the Mestalla as news filters through of a Zenit equaliser in Belgium. It's by no means a full house, but all four sides of the ground are rocking right now."

Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live

"Look at the Olympiakos players. Absolutely deflated."

You can almost hear a pin drop in the stadium now - home fans stunned into silence by the Olivier Giroud show.

I won't lie. I really did not think Arsenal had it in them to get the result they needed in Olympiakos. It didn't look likely at all for the first 20 minutes, but Arsenal have been clinical. 

John Murray

BBC Radio 5 live commentator in Greece

Reuters

"Rarely have I seen a goal scored which has initiated such silence."

GOAL - Olympiakos 0-3 Arsenal

Reuters

No danger of Olivier Giroud missing this one. He sends the goalkeeper the wrong way and his hat-trick - his first for Arsenal - has the Gunners into the last 16 surely. Olympiakos need to score three goals to change that.

PA

Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live

"He threw himself into block it, turned his head and it's hit his left hand. I think it's a little bit harsh. Where can he put his left hand? He's planting it as he goes down."

PENALTY TO ARSENAL

Big chance for Arsenal to finish this off now as Omar Elabdellaoui is deemed to handle a shot inside the area. Soft decision, not sure how he could have avoided the ball, he wasn't even looking at it. But here comes Olivier Giroud...

Elsewhere in Europe...

A quiet start to the second half across the continent.

Still Roma's 0-0 scoreline with BATE Borisov will be enough to take them through as Bayer Leverkusen are only drawing with Barcelona.

Still Porto are heading out as they trail Chelsea and Dynamo Kiev will move into second in that group, they lead Maccabi Tel Aviv 1-0.

Gent are leading Zenit - who have won all five games so far - and if it stays like that, they will join the Russian side in the last-16.

YELLOW CARD

Goalscorer Olivier Giroud is booked, the striker shown a yellow card after a foul.

Almost a chance for Olympiakos but, luckily for Arsenal, Brown Ideye's control inside the box is poor. In fairness, the cross comes in at pace, but he gets the ball tangled in his feet and it gives Arsenal time to get the challenge in.

Rio likes what he sees

While Arsenal's first goal came following a sustained spell of possession, their second was more against the run of play. But who cares? Arsenal certainly don't...

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Simple but very effective. This was how Chelsea rolled last season. Diego Costa (19) bullying defenders to hold up the ball, then bringing in the fleet-footed Eden Hazard (10). Hazard glanced up to pick out Willian (22), who drilled in his seventh goal of the season. And his first that isn't a free-kick!

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GREAT SAVE!

Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live

"It was an excellent save but what makes it better is it was going to Cech's right but he saved it with his left hand."

Tense, tense stuff at Olympiakos. 

First, Theo Walcott sees a shot from a decent position inside the area deflected behind for a corner. Could he have done better? Possibly.

Moments later, Petr Cech pulls off a big save, stretching out an arm to somehow keep out Kostas Fortounis' strike that seemed destined for the top corner. 

This game is far from over.

John Bennett

BBC World Service

"Interesting dynamic between the two Neville brothers in the dug out.

"Gary - who can't speak Spanish - sometimes needs to turn to Phil - who can speak Spanish - to shout instructions at the players.

"Gary may need Phil a lot more in this second half. Valencia have been unconvincing, the locals aren't happy."

Goal replay

Olivier Giroud (number 12) won the flick-on just outside the centre circle, then ran into the box and finished with aplomb. Not bad for a man who is struggling with a sore ankle.

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Ian Dennis

BBC Radio 5 live senior football reporter at Stamford Bridge

"Chelsea take a decisive step towards the knockout stages. Relief for Jose Mourinho."

GOAL - Chelsea 2-0 Porto

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A rare beaming smile from Jose Mourinho as Chelsea add a second. 

Easy as you like for the Blues as Diego Costa holds the ball up from a throw in, plays the ball to Eden Hazard, who in turn spots the run of Willian and sends him clear and the winger drives in low from the edge of the area.

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Sometimes one word is all you need....

Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live.

"We eulogised about the ball Ozil played in the first half, Joel Campbell has done the same. A wonderful pass to play Giroud in. Brilliant goal by Arsenal.

"Now just go through 10 minutes where you do not concede. Don't raise the hopes of Olympiakos."

GOAL - Olympiakos 0-2 Arsenal

AP

Scenes! Olivier Giroud, moments after taking that knock to his ankle, grabs Arsenal's second that, at the moment, is sending the Gunners into the last 16!

Brilliant from Joel Campbell, who holds up the ball inside the Olympiakos area, evades a couple of challenges and feeds a pass between defenders and into the path of Giroud, who fires home. 

Reuters

Alex Oxlade-Chamberlain is up and warming up, but Olivier Giroud looks to be good to continue as he runs off the problem and is back on the pitch.

Oh not a good start to the second half for Arsenal. Olivier Giroud goes over his ankle when he swings in a cross and he is straight on the ground, grimacing in pain.

Elsewhere in Europe...

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Javier Hernandez cancelled out Lionel Messi's opener in Leverkusen.

It puts the German side on the brink of qualifying but they need a win as things stand. Elsewhere in their group, Roma are level with BATE Borisov. The scores leave Leverkusen and Roma locked on six points as they both chase second but the Italians have a better head-to-head.

KICK-OFF

Back under way at Olympiakos. Chelsea players are just jogging back out on to the pitch now as well. Big 45 minutes coming up. Who will join Manchester City in the last 16?

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Earlier we asked you what your manager would doodle to pass time in a news conference. David has sent us this take on 'he loves me, he loves me not'.

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Yes, it was rather head-bendingly up, down, all round last night. Very much twisted melons on the football desk here in Salford.

.

Pressure? What pressure? Everything is going swimmingly for Jose Mourinho and Chelsea so far. They are winning 1-0 and top Group G as it stands. 

As we saw on Tuesday night, though, a lot could happen in the next 45 minutes...

Any idea?

Boo boys

John Bennett

BBC World Service in Valencia

"Gary Neville will have been told about these Valencia fans, he's getting an insight straight away. They are not happy with their team or the referee. Lyon have been the better side, the Valencia keeper making three decent saves.

"It's now a subdued atmosphere. As it stands Gary Neville and Valencia are heading for the Europa League, not the last 16."

Olympiakos had seven shots on goal in the first half but only one was on target. In contrast, two of Arsenal's four shots were on target. 

The Gunners are much more threatening where it matters.

Ian Dennis

BBC Radio 5 live senior football reporter at Stamford Bridge

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"It's been a hard fought 45 minutes. Eden Hazard's through ball on 12 minutes, Diego Costa one on one, it was saved but the rebound cannoned in as an own goal. Chelsea have had a couple of other efforts - on the stroke of half time, Iker Casillas just got a touch with his finger tips to deny Costa.

"Porto have had three players booked so they must keep their discipline. Rememeber they need to score two goals a things stand to progress with Dynamo Kiev leading in the other game."

Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live

"If Ramsey was OK he'd walk off. I hope he has not got caught on the old metatarsal. 

"It took Arsenal a while to grow into the game with such a noisy crowd. Olympiakos started lively but haven;t really looked like scoring. Once they scored the goal, they do look a much better side. At the moment, you'd think Arsenal would score the next goal."

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So far so good for Arsenal, but possibly some concern over Aaron Ramsey. As the players head towards the tunnel, he is sat on the pitch, before eventually getting up and hobbling off. Injured?

HALF-TIME

Diego Costa is firmly in the thick of things as the first half heads towards a close. He's on the receiving end of a couple of tough challenges, resulting in yellow cards for two Porto players. He then shoots just wide of the far post on the stroke of half time.

HALF-TIME

As this graphic shows, Arsenal's goal came at the end of a sustained spell of possession. This screenshot is taken between 26 and 30 minutes.

Opta

Arsenal need a second if they are to go through, but they also cannot really afford to concede. They have a lucky escape when Laurent Koscielny swings a boot wildly at Brown Ideye's cross and the ball flies over his own bar. Moments later, Athur Masuako brings a good save out of Petr Cech.

John Bennett

BBC World Service in Valencia

AP

"Gnaly Cornet with a lovely finish from the right hand side. A curling effort with his left foot. Gary Neville frustrated. At the moment he and Valencia are heading into the Europa League."

Porto are enjoying plenty of possession (60% to be precise), but are struggling to hurt Chelsea. 

The visitors have not directed a shot on target as Chelsea, shown by our average positions graphic below, are content to stay compact and hit their visitors through pacy counters.

Porto are going out as it stands, remember, with Dynamo Kiev leading 1-0 against Maccabi Tel Aviv.

Opta

Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live

"Walcott all over. Absolutely skipped past two tackles great balance, too easy, went to hit it and couldn't hit the target. He needs too many chances to score."

Disappointing from Theo Walcott as an attack that started out with promises fizzles out disappointingly. He breaks forward, gets to the edge of the area but fluffs his shot wide.

Elsewhere in Europe

Empics

Spanish football journalist Mike Holden at the Mestalla: "Gary Neville hasn't moved from the edge of his technical area yet. He seems to be in continual dialogue with João Cancelo, most probably because he's the only player within earshot. He just also happens to be playing at right-back. No pressure, João."

Whistles already?

It is still 0-0 in Valencia. Remember though, with Gent leading Zenit, even a win will not be enough for Gary Neville's new side.

Want him back?

Javier Hernandez has seven Champions League goals this season. Manchester United only scored seven on their way to a group-stage exit.

His Bayer Leverkusen side are still level at 1-1 with Barcelona. They need at least a win to stand a chance of progressing.

Ozil's touch map

Mesut Ozil is bossing this game now. Wherever the ball is, the Germany international tends to be. #pullingthestrings

Opta

Arsenal's goal has certainly shaken things up. 

Olympiakos, passing the ball about with a bit of swagger in the opening exchanges, are letting their frustrations show a bit as feet fly in on Laurent Kscielny as he attempts to take the ball forward from inside his own half. 

Free-kick, from which Olivier Giroud eventually wins a corner when his cross is deflected behind, but Mesut Ozil's ball into the area is headed away.

YELLOW CARD

Ah, it's not all rosy for Chelsea. Nemanja Matic earns himself a booking after cleaning out Porto's Yacine Brahimi with a lumbering challenge near the halfway line - and that means he is out of the Blues' next European game. At the moment that will be the first leg of their last 16 tie...

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It has all the hallmarks of Anfield May 26th 1989......win by 2 goals and the arsenal are through.

Ajay, London

Not talking it up at all there Ajay

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Here's a graphical replay of that Arsenal goal. That is exactly where you want your number 12 when he's called Olivier Giroud.

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Maybe Jose Mourinho's charm offensive in his pre-match news conference has resulted in some good fortune for the Blues. 

They almost get lucky again, Oscar's bending shot - after a slick one-two with Willlian - deflects off a Porto body and almost creeps past Iker Casillas. Chelsea are cruising.

Elsewhere in Europe...

Denis Garmash has put Dynamo Kiev ahead against Maccabi Tel Aviv, if it stays 1-0 and Chelsea beat Porto, then the side from the Ukraine will be into the last 16 along with the Blues.

Lionel Messi fired Barcelona into a lead at Bayer Leverkusen but Javier Hernandez levelled within three minutes.

And some bad news for Gary Neville. Gent lead Zenit. A win for the Belgian side means Valencia cannot progress, even with a win. Not in the script.

Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live

Reuters

"What an absolutely fantastic reverse pass by Ozil. The only player on the pitch capable of doing so. A great cross from Ramsey, a downward header, the keeper probably should do better but it was always going to go in."

GOAL - Olympiakos 0-1 Arsenal

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Big goal for Arsenal! Aaron Ramsey gets the ball from Mesut Ozil's brilliant reverse pass and clips an inch-perfect cross to the head of Olivier Giroud and his header has too much power for Roberto, as the ball squirms beyond him and in at the near post. 

One more goal for Arsenal without reply, and they will go through.

AP

A fan of tactics boards? Then you'll love this. Here's how Chelsea's opening goal unfolded, Eden Hazard (10) picking out Diego Costa (19) before Porto keeper Iker Casillas (12) saw his save rebound into Ivan Marcano's chest.

Opta

Chance! Finally a bit of zip about the Arsenal attack as Joel Campbell gets inside the area and cuts the ball back for Mathieu Flamini, who scoops a shot onto the crossbar. 

It has taken 25 minutes, but finally Arsenal threaten in the final third. That will give the away fans a lift. 

PA

Diego Costa can't help himself, can he? The Chelsea striker is winding up his Spain international colleague Iker Casillas, who tumbles to the floor after Costa challenges him for a loose ball. Casillas goes loco, Costa stands his ground. The referee pulls the pair away before the game resumes.

When you need to win by two clear goals, you don't want your most prolific passing combination being your two centre-halves passing it sideways...

It's not going well for Arsenal so far.

Opta

Mark Lawrenson

Former Liverpool defender on BBC Radio 5 live

"The game is just a little bit bitty at the moment, which suits Olympiakos of course.

"Walcott is not at the races, he looks short of pace."

Olympiakos have so much space when they attack but, luckily for Arsenal their shooting has been off as Felipe Pardo curls a shot wide from just outside the area. 

A helping hand

BBC

Last season the Blues only benefited from four OGs in total in all competitions. 

Just what Doctor Mourinho ordered. A huge slice of luck has helped the Blues because, before that fortunate own goal, Porto had been shading the contest.

#bbcfootball

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Yup, not much sign of them so far.

So far so good for Chelsea, but Arsenal have plenty to do. 

The Gunners are yet to test the home keeper, but are enjoying a bit more possession inside the Olympiakos half. Olivier Giroud heads down a cross inside the area, but fails to find a fellow blue shirt and the hosts clear.

DISALLOWED GOAL

John Bennett

BBC World Service in Valencia

Rex Features

"So close to a perfect start for Gary Neville. Mustafi has the ball in the net but it's ruled out. He is a suit manager not a tracksuit manager. He's a manager who will spend the whole 90 minutes on the edge of the technical area."

Elsewhere in Europe

Ian Dennis

BBC Radio 5 live senior football reporter at Stamford Bridge

Getty Images

"When you question what the official on the goal line does, he has just done his job. It did cross the line by about a foot in the end."

GOAL - Chelsea 1-0 Porto

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Big goal for Chelsea, and a huge slice of fortune about it too. Diego Costa is put through by Eden Hazard, Costa's shot lacks conviction and is blocked by Iker Casillas, but the rebound deflects off Ivan Marcano's chest a good 12 yards outand goes into his own net. A Porto player tried to keep it out and did hook the ball clear but it had already gone over the line.

"Theo". "Theo". "Theo".

"Get the number 14 and tell him to track back, lads..."

Opta

PENALTY APPEAL

It is all Olympiakos at the moment. 

A nervy moment for Arsenal as Kostas Fortounis falls over inside the area. He wasn't even that close to Theo Walcott. The referee blows his whistle, walks straight over...and books Fortounis for diving.

Chelsea's defence is worryingly pedestrian. 

There's no urgency or desire to press as Porto patiently pass the ball around the edge of the area, and it almost proves costly as Yacine Brahimi is given the chance to have a crack at goal at Thibaut Courtois' near post, but the Chelsea keeper is alert enough to thump the ball away.

One-sided stuff

Since Theo Walcott was clattered, Arsenal have not bothered attacking down the right...

Opta

Brown didn't bang them in...

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Arsenal have nothing to worry about, Brown Ideye is up front for Olympiakos.

He managed seven goals in a season at West Brom before being shipped off to Greece during the summer.

Great headphones though.

Bring the noise

Getty Images

Very hostile atmosphere in Athens as every touch of the ball by an Arsenal player is greeted by a chorus of boos. Theo Walcott is clattered as Olympiakos players make their presence known. No clear-cut chances as yet, though.

Early chance for Chelsea as Willian swings a free-kick into the area from midway inside the Porto half. It deflects behind for a corner, but it comes to nothing.

The 12th man

Mark Lawrenson

Former Liverpool defender in Greece

"I think this stadium is worth a goal start as well as the advantage they already have."

KICK-OFF

Reuters

Here we go. Games across Europe are getting under way.

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Tell us or, if you are feeling creative, draw what it would be and send to #bbcfootball.

You can also text in on 81111 (UK only) and post on the Match of the Day Facebook page.

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This is a fancy drawing indeed. We can see Louis van Gaal and assume this is Memphis Depay?

Is he handing him over? Giving him back?

Walk this way for Europa League football

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Will Chelsea and Arsenal avoid following Manchester United out of the Champions League and into Thursday night football? 

We'll find out soon enough, with kick off almost upon us.

Feel the noise...

John Murray

BBC Radio 5 live commentator in Greece

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"It's quite a sight in this stadium. The teams walk slowly out. I'm watching Petr Cech and Per Mertesacker flexing their muscle. This stadium is wonderfully atmospheric, it's relatively new, there are streamers coming from the back of the stand to the front. Arsene Wenger said it would be hostile and so it is."

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Don't worry Matt - you're out on your own.

Intimidating stuff at Olympiakos.

Both sets of teams wait in the tunnel, a banner with the words "we rule this land" hangs above the exit onto the pitch. 

As the players walk out, the home fans hold up white and red flags, with huge cheers as the home team emerges. 

Snap of Gaz anyone?

John Bennett

BBC World Service in Valencia

"The photographers are ready for Gary Neville. A big moment for Neville was a first ever team selection, it contains two changes. It's a must win, Valencia have to beat Lyon. What will he be like in the dugout? The Mestalla - and some of Spain's most volatile support - is ready."

Elsewhere in Europe

Spanish football journalist Mike Holden at the Mestalla: "Two changes from Saturday's 1-1 draw with Barcelona. Ruben Vezo is suspended, so in comes Joao Cancelo at right back. Shkodran Mustafi returns from hamstring trouble and will partner Aymen Abdennour at centre back, meaning Anderlan Santos drops to the bench. Looks like 4-3-3 again."    

Who needs what

A final reminder of what is needed for Arsenal and Chelsea to go through. First up, Arsenal:

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Meanwhile, if Chelsea avoid defeat, they are through.

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Ready to roll...

A decisive night for the 'Special One'

Ian Dennis

BBC Radio 5 live senior football reporter at Stamford Bridge

"I think tonight if Jose doesn't get the win his position will be extremely precarious. You cannot underestimate the significance of this game at Stamford Bridge."

A big night for Jose

Mark Lawrenson

Former Liverpool defender in Greece

"If Chelsea do go out of the Champions League this evening I really do think Jose Mourinho is under massive pressure because what will be left for Chelsea to go for this season."

Mourinho not contemplating exit

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Chelsea manager Jose Mourinho, talking to BT Sport, says he has not contemplated the Blues failing to reach the last 16:

"Winning the group is the objective but if in the end we get a draw and qualify that is good.

"But we don't plan to start the game with that in mind - we want to win. We know winning is difficult, because this is not a group match now - this is knockout now."

On Diego Costa returning to his starting XI: "It's not about Costa, it's about the team. There is a clear contrast between our results and the atmosphere in the squad. I understand people have doubts, but the players want to win. I hope the contradiction ends tonight.

"But we need to put the ball in the net which we have not been doing."

A final reminder of the Chelsea team. Big night for Diego Costa, can he fire the Blues into the last 16 and ease the pressure on his manager?

Chelsea XI: Courtois; Ivanovic, Zouma, Terry, Azpilicueta; Ramires, Matic; Willian, Oscar, Hazard;Costa.

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A tough day for Garry Monk - but it could end up being a very relaxing Christmas. 

We've been asking what doodles your manager would draw during a press conference. Send them over to #bbcfootball

'Theo doesn't have 90 minutes in him'

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Arsenal manager Arsene Wenger, speaking to BT Sport: "We have to be brave - it will be hostile against a motivated team who are physically very strong. We need to be committed but disciplined and controlled.

"I gave Theo half an hour at the weekend. I don't think he has 90 minutes in his body at the moment but I decided to start him. It's risky, but we need to score goals tonight so it was needed.

"We need to produce a top, top, top performance because I think Olympiakos are an under-rated team."

Team news

Here's a reminder of how Arsenal will line up tonight. It will be interesting to see how far forward Theo Walcott will play, on his return to the side in place of The Ox.

Arsenal XI: Cech; Bellerin, Mertesacker, Koscielny, Monreal; Ramsey, Flamini; Ozil, Walcott, Campbell; Giroud.

Olympiakos: Roberto; Elabdellaoui, Da Costa, Siovas, Masuaku; Kasami, Milivojevic, Fortounis, Seba, Pardo; Ideye.

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Can Arsenal avoid a slip-up in Greece? They have failed to win there in each of their last five visits.

What's key?

Mark Lawrenson

Former Liverpool defender in Greece

"It is very difficult for Arsenal. If they can get that first goal in the first 25 minutes it will change the opposition's thinking. It will change the dynamics. Suddenly you think 'we can do this'."

You can listen to Mark on BBC Radio 5 live now.

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Arsenal fans may not want to remember their brief European campaign 16 years ago - the last time they failed to reach the last 16 - but Manchester United supporters will be wishing they were partying like its 1999.

That was the year they staged one of the most memorable comebacks in football to win the Champions League, beating Bayern Munich 2-1.

Nothing memorable about this year's adventure as Louis van Gaal's side failed to reach the last 16 after losing 3-2 to Wolfsburg on Tuesday. 

All that money spent and they finished their most important game of the season so far with Jesse Lingard, Nick Powell and 18-year-old Cameron Borthwick-Jackson in their side. Madness.

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'Ozil masterclass needed'

Phil Wye

BBC Radio 5 live in Athens

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"A walk up to the mighty Acropolis of Athens this morning yielded a chat with a few Arsenal fans.

"General consensus among them was optimism, that the Gunners won't get turned over tonight but that a two-goal or 3-2 win would be "a big ask." 

"Minus Sanchez, Cazorla & Coquelin in their ranks, it's hard to disagree.

"Olympiakos have a 100% domestic record this season and only Bayern Munich - in Champions League Group F - have toppled Greek football's number one team.

"But Arsene Wenger reminded us yesterday that his Arsenal teams "have a history of positive results" and suggested that Olympiakos have it all to lose.

"Can't help but think that for the Gunners to pull this off, a Mesut Ozil masterclass will be needed this evening."

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Tough gig Kev, tough gig.

Diego, Diego, Diego!

BBC Radio 5 Live

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Diego Costa is currently going through the pre-match warm-ups with the rest of the Chelsea squad. 

Would the Blues be better off without the striker? That's one of the questions Mark Chapman, Mark Lawrenson, John Murray and the Daily Mail's Neil Ashton are debating right now on BBC Radio 5 live.

What do you think? Diego's fault or - as Ashton wrote on Sunday - isMourinho losing a grip?

Point to prove for Casillas

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Iker Casillas is in the Porto goal tonight. Could be an awkward encounter if he bumps into Jose Mourinho in the tunnel before kick off.

The two fell out when Mourinho was manager of Real Madrid, with Casillas dropped from the side.

No doubt he'll have a point to prove tonight.

Porto parking the bus?

Porto need a win at Stamford Bridge to top Group G - but the Portuguese runners-up have not named an adventurous side.

Five recognised defenders, two holding midfielders and no out-and-out striker.

A draw will be enough for Porto to finish as group winners, with Chelsea progressing as runners-up - unless Dynamo Kiev win and the Portuguese side are out. Confused? Here's why.

Porto XI: Casillas, Maxi Pereira, Martins Indi, Maicon, Marcano, Layún, Brahimi, Herrera, Danilo, Imbula, Corona.

'Give the lad a chance'

Mark Lawrenson

Former Liverpool defender in Greece

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"I think it's great for Gary Neville. I don't know him fantastically but I think he will look at the players and give them a chance, regardless of who they are or who their agent is. 

"It's typical of us to all start saying 'he is the next Manchester United manager' or 'he is the next England manager'. He hasn't even managed a game yet, give the lad a chance."

Excitement building at Valenica

John Bennett

BBC World Service in Valencia

BBC

"The fans I've been speaking to here at the Mestalla seem pretty excited about what Gary Neville can bring to the club.

"They're skeptical about his close links to the owner and his lack of management experience but seem delighted to have got rid of the previous coach.

"The supporters here have the reputation of being the hardest to please in Spain but - for now - Neville has their backing.

"Neville certainly won't let them down when it comes to hard work. I saw him arriving at the Mestalla today seven hours before kick-off."

Nev's new challenge begins...

BBC

Nothing like a pressure-free start to life at a new club, in a new country, with a new language and new players and a new role - manager - for the first time. Gary Neville has it easy - win or bust in the Champions League.

"It is impossible for me to play down expectation," said the new Valencia boss ahead of their fixture with Lyon. "There's no point in low ambition, I wouldn't be here. I'm focusing on staying calm, doing the work withe the players. It's impossible to get everything into the players in 48 hours."

Valencia will reach the round of 16 if they win and Gent fail to beat group leaders Zenit in Belgium.

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We are absolutely loving these. Kind of got a bit of a top-flight feel to them though.....

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It is hard to remember a time when Arsene Wenger wasn't in charge of Arsenal but if they go out of the Champions League tonight, the pressure on him would crank up a notch. 

Jose Mourinho is already a man under pressure, but who do you think will last the longest in their current jobs - Wenger or Mourinho?

You can vote now by choosing your option on the right side of this page (desktop) or by clicking the vote tab if you are following on a mobile device.

Voting closes at 20:30 GMT. Terms and conditions are here.

From the press box

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Bye then Gaz...

BBC Radio 5 Live

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Briefly away from the Champions League and the big news in football earlier today was the departure of Garry Monk from Swansea.

Less than three months ago Monk wasreportedly on an FA shortlist to be the next England manager.

Monk's fall from grace has been remarkable and you can listen to Mark Chapman, Mark Lawrenson and John Murray debate his dismissal from 19:00 GMT on BBC Radio 5 live.

Who do Swansea go for next?

Arsenal's biggest test

Mark Lawrenson

Former Liverpool defender in Greece

"I think this is a massive ask for Arsenal. Possibly their biggest in the years in which they've played at this stage. If Olympiakos get a 2-1 defeat and go through. They can sit deep and say 'go on then try and beat us'. From their point of view it's easy. Arsenal have to go for it, with the caveat that you can't go 1-0 down."

You can listen to Mark Lawrenson along with John Murray and Ian Dennis on BBC Radio 5 live now. Click 'live coverage' at the top of this page.

Breaking Arsenal team news

Strong Arsenal side as Olivier Giroud and Theo Walcott both start. That, I believe, is the first time this season they have both started in the same match. 

Giroud looks to be playing as a lone striker, with Mesut Ozil, Walcott and Joel Campbell behind.

Arsenal XI: Cech; Bellerin, Mertesacker, Koscielny, Monreal; Ramsey, Flamini; Ozil, Walcott, Campbell; Giroud.

Mark Lawrenson

Former Liverpool defender in Greece

"Costa has to be playing for his Chelsea future. He just hasn't done enough. Also, what has happened to Fabrega? He seems to have lost half a yard and doesn't seem to be able to get into positions to help the team."

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Tonight we are asking you what your manager would doodle in a news conference to pass the time when facing questions.

Philip Harr has made us all laugh already, referencing ex-Leicester manager Nigel Pearson who you may recall called journalist Ian Baker "an Ostrich" during a news conference last season.

"If you don't know the answer to that question, then I think you are an ostrich. Your head must be in the sand. Is your head in the sand? Are you flexible enough to get your head in the sand? My suspicion would be 'no'."

Anyone else miss Nigel?

Chelsea team news

Last season tonight would have been a banker of a home win for this Chelsea team. But tonight....?

Jose Mourinho has brought back the big names, making four changes from the side which started Saturday's shock 1-0 home defeat by Bournemouth.

Skipper John Terry returns from injury to replace Gary Cahill at centre-back, while Cesar Azpilicueta is preferred to Baba Rahman at left-back.

Ramires starts in midfield as Cesc Fabregas drops to the bench, while Diego Costa steps up in place of Pedro.

#bbcfootball

What Chelsea need

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Whoever wins in the game between Chelsea and Porto will top  Group G.

Dynamo Kiev - who face Maccabi Tel Aviv - will be sure of a place in the last 16 with a win thanks to a superior head-to-head record against Porto.  

If Kiev win and Chelsea and Porto draw, all three teams will finish on 11 points. Their fate would then be decided by their three-way head-to-head record - with their group results against each other converted into a mini-league - and it would be Porto who finish third and head into the Europa League.

If Chelsea lose and Kiev win, the Blues are out.  

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Mourinho on the brink?

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Chelsea may just need a point, but that is far from a certainty given their form this season.

Jose Mourinho's side are 14th in the Premier League and out of the League Cup, and really need Champions League success to rescue a miserable season.

However, they lost at home to Bournemouth last-time out and there have been reports that Mourinho could be sacked if the Blues lose their next two games, starting with Porto tonight.

The pressure is on.

What would your boss doodle?

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Here's my effort to kick things off. 

Club: Huddersfield. Manager: David Wagner. Picture: Bratwursts and a Stein because, after a few weeks of living in West Yorkshire and feasting on cake buttys and chips, the former Borussia Dortmund assistant is probably missing some home comforts right about now...

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David Wagner swapped Dortmund for Huddersfield last month

Send yours in and let us know who would draw it and what it would represent via #bbcfootball

Get involved

It appears to have got graphologists stumped, so what do you reckon Arsene Wenger's doodle is? 

What do you think your manager would sketch to pass the time in a press conference, and what would it mean?

Tell us or, if you are feeling creative, draw what it would be and send to #bbcfootball.

You can also text in on 81111 (UK only) and post on the Match of the Day Facebook page.

Spaceship, or Wenger's cunning plan?

Daily Express

Think this is just a mindless doodle? Think again for this could actually be a revealing look at the inner workings of Arsene Wenger's mind.

The Arsenal boss left the above scrawling on his notepad after speaking to the media in his pre-Olympiakos news conference on Tuesday.

"At first glance it looks like a spaceship - that suggests very big thinking. A significant issue," Elaine Quigley of the British Institute of Graphologists with a special interest in doodles, told the Daily Express.

“Certainly the four circles are significant – he clearly feels there are four key areas to this game."

Fascinating. Almost as fascinating as the revelation that there are people who specialise in doodles.

Is England in the danger zone?

BBC Radio 5 Live

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At around 22:00 GMT tonight, England could have just one team through to the knockout stages of the Champions League. 

Manchester City are of course there, but Manchester United are out and both Chelsea and Arsenal must deliver tonight.

Tune into BBC Radio 5 live right now where Mark Chapman, 5 live football correspondent Ian Dennis and European football writer Andy Brassell will discuss why there have been English struggles.

BreakingBreaking Chelsea team news

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A couple of familiar names are back in the Chelsea line-up...skipper John Terry and striker Diego Costa both start.

Chelsea XI: Courtois; Ivanovic, Zouma, Terry, Azpilicueta; Ramires, Matic; Willian, Oscar, Hazard;Costa.

What Arsenal need

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Arsenal can qualify in second place with a better head-to-head record than Olympiakos. 

They need a win in Athens that 'beats' Olympiakos' 3-2 win in London in September. 

Basically any win apart from 1-0 or 2-1 will see Wenger's boys through.  

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Crunch time

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If you thought last night was a big night of Champions League football, then tonight has the potential to be even bigger. 

Both Arsenal and Chelsea are in action, against Olympiakos and Porto respectively, and both need positive results to be able to secure their place in the last 16.

A point at home to Porto will do the job for Chelsea, but Arsenal's task is a little trickier...

Walking the tightrope

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Imagine a world without Facebook. One without Twitter or Snapchat, when flipscreen mobile phones were all the rage and the BBC Sport website looked like it did in the picture above.

That was the world back in 1999, when Arsenal last failed to reach the last 16 in the Champions League.Tonight, for the first time since that year, they are on the brink of early elimination from the competition again.

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