Manchester City boss Manuel Pellegrini had to dash back home to get his 'correct' passport before the flight out to Germany this afternoon. We've all done it...

Theo Walcott is banging them in in the Premier League - and with Olivier Giroud suspended tonight he is up front again.

But Walcott has failed to score in his last eight Champions League games at the Emirates, his last goal dating back to December 2010 against Partizan Belgrade.  

Image source, Reuters

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Are Croatian club Dinamo Zagreb capable of pulling off two shocks in a row? 

Victory away to Pep Guardiola's Bayern Munich really would make it a sensational start to the group stage, after beating Arsenal at home. It would also extend their unbeaten streak to 46 matches in all competitions. 

The thing is though, Robert Lewandowski is in scintillating form. He followed up his five-goal haul from those nine insane minutes against Wolfsburg with another two goals in 13 as Bayern racked up a seventh league consecutive win on Saturday.

Arsenal

"The changes tonight are just to keep the balance. We will focus on the team performance not the individual.

"We have no room for any failure art all. We have to respond to our first defeat. We are focused."

John Murray
BBC Radio 5 live commentator

Phil McNulty
BBC Sport chief football writer

"Arsenal are already on the back foot in their Champions League campaign after surprisingly losing their opening group game to Dinamo Zagreb in Croatia. With Bayern Munich already looking overwhelming favourites in the group, Arsenal simply cannot afford anything other than victory against Olympiakos at The Emirates tonight.

"Gunners' boss Arsene Wenger is well aware of Arsenal's needs and writes in his programme notes: "You have to win your home games if you want to qualify from the group stage. It is as simple as that."

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Defending champions Barcelona are welcoming German club Bayer Leverkusen tonight - and the Spanish champions will be without the injured Lionel Messi, who's out for the next seven to eight weeks.

Just Neymar and Luis Suarez then.

Leverkusen, runners-up in 2000 (remember that Zidane volley?) have only scored seven goals in the first seven matches of the Bundesliga season, since selling forward Son Heung-min to Tottenham. 

How many will they get tonight? Barca conceded four against Celta Vigo last Wednesday...

Jose Mourinho has had many players, for many teams, over the past decade. But how do a select three sides match up?

His breakout Porto side of 2004 contained some key men who would follow Jose to Chelsea later that summer in right-back Paulo Ferreira and centre-half Ricardo Carvalho, while Deco would eventually play for the Blues too after a successful stint at Barca.

Maniche also had a spell with the London club.

This Chelsea side - in Jose's second season at Stamford Bridge - went out of the Champions League to Barcelona.

But was this his best team to watch? Arjen Robben and Damien Duff, Claude Makelele in the role he made his own, Frank Lampard and Didier Drogba weighing in with the goals..

Or does the current vintage float your boat? This time last year you could perhaps argue that they were the best side. But who is in good form at the moment?

Mark Lawrenson
BBC Radio 5 live in the Estadio do Dragao

"If you were looking to build a dream team last season, you would have started with the Chelsea back five. 

"Last year nobody could score, and that bought the team time for the more creative players to go and win games.

"But this year they've conceded 14 goals in their first seven league games. It’s just not happening."

There are two games taking place in the Championship this evening.

Lee Carsley takes charge of Brentford for the first time as they face Birmingham at Griffin Park.

Meanwhile Wolves are looking for their first away win of the season at Fulham, who name an unchanged team from their 4-0 thumping of QPR last week.

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Robert Lewandowski, who has scored seven goals in his last two matches, starts up front forBayern Munich,who also name 20-year-old midfielder Joshua Kimmich in their starting line-up.

Bayern XI: Neuer, Alaba, Boateng, Bernat, Thiago, Costa, Gotze, Lahm, Kimmich, Coman, Lewandowski.

Zagreb XI: Eduardo, Benkovic, Măţel, Taravel, Antolic, Machado, Ademi, Pivaric, Soudani, Fernandes, Pjaca.

In 2006 Jose Mourinho named eight of his side as 'the untouchables.'

They were in for every game, no matter what, as they were that good.

Today he says he has none.

But what are you untouchable at?

Image source, Getty Images

If your CV had a section for those life skills that you rule at - no matter now trivial - what would you have to offer?

Maybe you're amazing at reverse parking, can name all 50 state capitals of the US, can recite every line of dialogue from Die Hard With A Vengeance or can carry six pints at once (I've seen it done - she was quite a girl).

Whatever the skill, no matter how trivial, I want to know.

Get in touch at #bbcfootball, pop on to the BBC Match of the Day Facebook page or BBC Sport's Google+ area. You can also text us on 81111 in the UK only - don't forget to say who you are and where you are texting from.

Start your message with :"I am UNTOUCHABLE at..."

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Arsenal

Arsenal make five changes from the weekend's win over Leicester with David Ospina replacing Peter Cech in goal and Gabriel coming in for Per Mertesacker.

Kieran Gibbs, Alex-Oxlade Chamberlain and Francis Coquelin have also come in.

Arsenal XI: Ospina, Bellerin, Koscielny, Gabriel, Gibbs, Cazorla, Coquelin, Oxlade-Chamberlain, Ozil, Alexis, Walcott.

Olympiakos XI: JimEnez, Elabdellaoui, da Costa, Siovas, Masuaku, Domínguez, Cambiasso, Kasami, Sebá, Ideye, Pardo 

Benni McCarthy, part of Porto’s Champions League-winning squad under Jose Mourinho in 2004, is backing his old club to put one over Chelsea.

“I’ve got mad love for Mourinho,” the retired South Africa international told World Service’s Sport Today. “But if there is a day to go against him, it’s this day. I’m going for Porto.”

Image source, Getty Images

Bayern Munich had just "14 or 15" fit players their game with Dinamo Zagreb, says boss Pep Guardiola.

Midfielders Arturo Vidal, a Copa America winner with Chile this summer, and Sebastian Rode are the latest players to receive treatment.

Vidal is nursing a knee problem while Rode has had treatment for a knock.

"We are only a few, only 14, 15 players. So we will need one or two from the second team," added Guardiola.

Image source, Reuters

Bayern are already without wingers Arjen Robben and long-term absentee Franck Ribery as well as defenders Medhi Benatia and Holger Badstuber.

Midfielder Javi Martinez only recently came back from a four-week injury break.

I'm sure Pep could still do a job...

Phil McNulty
BBC Sport chief football writer at the Emirates

"If the jolly scenes involving hordes of Olympiakos fans at Oxford Circus tube station are anything to go by we are in for a very noisy evening at The Emirates as they face Arsenal in the Champions League group stage - all very good-natured and all very full volume."

Barcelona v Bayer Leverkusen

Porto v Chelsea

Arsenal v Olympiakos 

Bayern Munich v Dinamo Zagreb

Mark Lawrenson
Former Liverpool defender on BBC Radio 5 live

Chelsea

Eden Hazard misses out for Chelsea, as does John Terry, as Kurt Zouma continues to partner Gary Cahill in central defence.

Midfielders Willian and Ramires both start after coming on as substitutes against Newcastle at the weekend.

Chelsea XI: Begovic; Ivanovic, Zouma, Cahill, Azpilicueta; Mikel, Fabregas; Ramires, Willian, Pedro; Diego Costa

Iker Casillas becomes the Champions League's highest appearance maker on 152 as he starts for Porto, while Yacine Brahimi has overcome a knee injury to make the starting XI.

A man who's so good they named him twice, Andre Andre, forms part of the Portuguese line-up.

Porto XI: Maxi, Maicon, Marcano, Martins Indi; Danilo, Ruben Neves, Imbula; Brahimi, Aboubakar, Andre Andre

Image source, BBC Sport