Clashes broke out inside the Athens Olympic Stadium ahead of AEK's Champions League match against Ajax on Tuesday.
Ajax fans were attacked by a mob of Benfica hooligans in the Portuguese capital after their Champion League match on Wednesday night.
A group of Ajax fans were attacked by Dynamo Kyiv hooligans as they relaxed at a Kyiv pub before a Champions League play-off tie on Tuesday.
A group of Roma hooligans attacked Liverpool supporters outside Anfield before Tuesday’s Champions League semi-final between the two sides.
Bayern Munich fans were attacked by Spanish riot police at the Santiago Bernabeu during their Champions League match against Real Madrid on Tuesday night.
Dynamo Kyiv and Beşiktaş hooligans clashed before and during their Champions League match on Tuesday.
Legia fans clashed with Spanish riot police ahead of their Champions League meeting with Real Madrid on Tuesday.
Legia hooligans clashed with stewards in the stands at the Polish Army Stadium during their Champions League game against Borussia Dortmund on Wednesday.
Olimpija and Žilina hooligans clashed ahead of the Slovenian side's Champions League 2nd qualifying match with AS Trenčín at the Štadión pod Dubňom on Wednesday.
Members of the Delije attacked the Bad Blue Boys at Athens International Airport the day after a Champions League game between Olympiakos and Dinamo Zagreb.
Slask Wroclaw hooligans attacked Sevilla fans outside a bar in Shambles Square in Manchester city centre on Wednesday afternoon.