PSG and Galatasaray fans clashed in the French capital ahead of the teams' Champions League meeting at the Parc des Princes on Wednesday.
AIK hooligans tried to attack rival Maribor fans during their Champions League second qualifying round second leg match on Wednesday.
Ajax fans clashed with cops outside the Johan Cruyff Arena ahead of their match against Juventus on Wednesday.
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 Warsaw fans were involved in a series of scuffles with Spanish riot cops 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.