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."

John Bennett
BBC World Service in Valencia

Image source, Getty Images

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

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...

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.

Image source, Getty Images

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.

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

Image source, Reuters

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

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."

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...

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.

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.