UEFA said its disciplinary body ordered AEK to pay Bayern €10 euros for each of the 3,288 tickets sold to away fans for an October UCL match.
Isco was whistled by Real Madrid fans in their 3-0 defeat to CSKA Moscow after appearing to react with a gesture and angry words towards supporters.
Bayern Munich forward's boot to the back of Nicolas Tagliafico's head was possibly the most "on-brand" red card ever.
The Champions League group stage is over, but who were the stars of the final group stage games? Here's the best XI from Matchday 6.
"The reports we have received from our supporters are obviously of great concern to us and we shall be contacting the relevant authorities."
Both teams were out of contention for the knockout stage, and Benfica had already secured third place and a spot in the Europa League.
Olympique Lyonnais earned the point they required to book their place in the Champions League last 16 with Nabil Fekir's equaliser.
Robert Lewandowski scored twice as Bayern Munich sealed top spot in Group E following a thrilling 3-3 draw at Ajax.
Man United's woes continued at Valencia, as a catastrophic error for an own goal by Phil Jones summed up the latest frustrating night for United.
"It's job done in a difficult group," Mourinho said. "I don't think we were brilliant in this group phase but we did enough to qualify."
Manchester City battled back to winning ways, coming from a goal down to overwhelm Hoffenheim 2-1 in the Champions League.
Viktoria Plzen beat struggling Roma 2-1 in the Champions League on Wednesday to earn a Europa League spot.
Manchester City trailed Hoffenheim at home, only for Leroy Sane to score twice -- including an incredible free kick -- to earn a comeback win.
Two goals from striker Guillaume Hoarau led Young Boys to a shock 2-1 Champions League win over already-qualified Juventus on Wednesday.
Carlos Soler's strike and Phil Jones' own goal gave Valencia the win over Manchester United in Champions League Group H action on Wednesday night.
"It is normal for the fans to express themselves, if they do not like the result, what they saw. But we did not like it either," Solari said.
Captain on the night, Marcelo led an experimental Real Madrid vs. CSKA Moscow. Unfortunately, he was their worst performer in a shock 3-0 defeat.
An inexperienced Real Madrid side were defeated 3-0 by CSKA Moscow in their final Champions League group stage game on Wednesday at the Bernabeu.
Tuesday night at the San Siro could serve as a "how-not-to" manual for clubs attempting to seal a place in the Champions League knockout rounds.
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