Petr Cech set to miss out against Bayern Munich as Arsenal boss Arsene Wenger puts his faith in David Ospina 

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Arsenal boss Arsene Wenger faces a huge decision ahead of the trip to Bayern Munich, with Petr Cech and David Ospina both vying for a starting place at the Allianz Arena.

Ospina has started every European game for Arsenal this season, although Cech - the only Champions League winner in Wenger's squad - has been preferred to the Colombian in the Premier League.

Cech has come under scrutiny in recent months after a number of unconvincing performances and Wenger is expected to put his faith in Ospina for the trip to Bavaria.

Arsene Wenger faces a selection dilemma ahead of Arsenal's trip to Bayern Munich

David Ospina (right) is expected to start against Munich with Petr Cech dropping to the bench

Arsene Wenger has started the Colombian in all of Arsenal's European games this season

Cech has come under scrutiny in recent months after a series of unconvincing performances

With his side still 10 points off the pace in the Premier League, Wenger knows this week is pivotal to Arsenal's chances of success this season.  

Wednesday's match will be the fourth time in the last five seasons in which Arsenal and Bayern Munich have met in the Champions League. 

The Gunners then face a potentially tricky FA Cup tie against non-League Sutton United on the artificial pitch at Gander Green Lane on Monday. 

The Gunners were put through their paces as they prepare for Wednesday's trip to Germany

Germany international Mesut Ozil covers his face with a scarf in chilly conditions in London

Arsenal defender Hector Bellerin works on his agility while Mohamed Elneny watches on

The Spain international performs a stretch during the training session on Tuesday

Arsenal suffered a humiliating 5-1 defeat to Munich the last time the two clubs met but Wenger believes his side can claim a positive result in Germany.

'Yes, we've had bad experiences against them,' Wenger told Arsenal.com. 'But I feel that this is a good opportunity.

'We have won there before and we play the first game away from home, so it's important we protect the second game because I feel that to have a chance to qualify in the second leg, that will be very important. 

Per Mertesacker (left) and Theo Walcott warm-up in similar fashion at London Colney

Arsenal will face Bayern Munich in the Champions League for the fourth time in five seasons 

The Gunners will then play non-League Sutton United in the FA Cup on Monday night

'We go there not high, but to defend well as a team.' 

The 67-year-old Frenchman, who has faced criticism from some sections of the club's support this season, cast his eye over a training session at London Colney on Tuesday.

Both Cech and Ospina took part, as did the majority of Arsenal's first-team squad.

Wenger has almost a fully fit squad to choose from for the trip to Germany, with only Aaron Ramsey and Santi Cazorla set to miss out.  

England international Alex Oxlade-Chamberlain takes a shot during the session

International team-mates Walcott (left) and Danny Welbeck help each other stretch

France international striker Olivier Giroud plays a pass to a team-mate