Carlos Tevez's apparent refusal to play for Manchester City last night overshadowed Bayern Munich's brilliant display at the Allianz Arena.
City found themselves under siege and 2 down before half-time, with striker Mario Gomez grabbing both of the goals for the home side.
Roberto Mancini tried to change things in the 2nd half, but Tevez appeared unwilling to play, with his City career later declared "finished".
Manchester United also endured a miserable night in Europe, salvaging a point in a shock 3-3 draw with Basel at Old Trafford.
United were 2-0 within 20 minutes thanks to Danny Welbeck, but Basel fought back to lead 3-2 before Ashley Young's late equaliser.
Manager Sir Alex Ferguson expressed his disappointment at the result, which leaves his side 3rd place in Group C with just 2 points.
Chelsea are in Champions League action tonight, looking for 3 points at Valencia to strengthen their position at the top of Group E.
Juan Mata makes his return to the Mestalla, as part of a Chelsea front line likely to feature both Fernando Torres and Nicolas Anelka.
Arsenal go into their Group F match with Olympiakos coming off of morale boosting back to back wins in the Barclays Premier League.
Arsene Wenger could rest Robin van Persie and Mikel Arteta, while handing a Champions League debut to Alex Oxlade-Chamberlain.
In transfer news, Arsene Wenger is facing the prospect of Spanish giants Real Madrid rivalling Arsenal for the signature of Eden Hazard.
New Inter Milan manager Claudio Ranieri is said to be readying an offer for Dirk Kuyt, following the Italian club's failed bid this summer.
And finally, Tottenham Hotspur are set to offer Luka Modric a new contract in order to fend off interest from both Chelsea and Man United.