Arsenal's defeat to Bayern Munich at the Allianz Arena has made progress in the Champions League for the Gunners appear near impossible. However, reaching the knock-out stages is perhaps not quite as unlikely as it seems.
Arsene Wenger's side had a dreadful start to their European campaign, losing their opening two games to Olympiakos and Dinamo Zagreb. But a win over Bayern Munich at the Emirates gave the club hope.
The 5-1 loss to Bayern on Wednesday, the club's biggest ever defeat in the Champions League, leaves Arsene Wenger's side on three points, six behind their German conquerors and Olympiakos with two games to play.
Next up for Arsenal is Dinamo Zagreb at the Emirates. Arsenal have to win that. They must also hope Bayern Munich beat Olympiakos that same night, a result which seems likely based on the performance of Pep Guardiola's side against Arsenal and that Bayern won 3-0 when the sides met in Greece in September.
It will then all come down to Arsenal's game against Olympiakos just outside Athens. Again, Arsenal have to win, but not only that, they must win by a two goal margin. That's because a victory would put them level on nine points with their Greek opponents, meaning they would be split on head-to-head record. Olympiakos won 3-2 at the Emirates earlier in the month.
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So how tough will beating Olympiakos by two goals be? Well, when Arsenal last played at the Karaiskakis Stadium in 2012, they lost 2-1. The time before that they lost 3-1 and in 2009 they lost 1-0. Manchester United, the last Premier League side to play at the Karaiskakis Stadium, lost 2-0. However, as already mentioned, Bayern Munich managed to win by a three goal margin there earlier this season.
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