Borussia M'gladbach hooligans managed to pinch a Köln flag during Köln's away match against Hoffenheim on Saturday.
Dynamo Kyiv hooligans were involved in a confrontation with cops outside the ground during their side's clash with Mariupol on Sunday.
GKS Tychy’s home match against Ruch Chorzów was briefly halted on Saturday because of trouble in the stands.
Los Andes fans fought amongst themselves during their Primera B Nacional match against Brown de Adrogue on Saturday.
Angry Lille fans invaded the pitch to confront their own players following a 1-1 draw with Montpellier on Saturday.
Go Ahead Eagles fans attacked De Graafschap players after a 4-0 home defeat in the Dutch second division on Sunday.
Saturday's derby between Piast Gliwice and Gornik Zabrze was abandoned because of fan trouble.
Raja Casablanca fans clashed with cops in the stands during Sunday's game against Kawkab Marrakech.
Athletic Bilbao and Spartak Moscow fans clashed on the streets of the Basque city ahead of their Europa League match on Thursday night.
Fan trouble broke out at the DW Stadium after Wigan Athletic's 1-0 win over Manchester City in the FA Cup on Monday evening.
Clashes broke out between Olympiacos hooligans and riot police at the Georgios Karaiskakis Stadium on Sunday after Olympiacos lost 2-1 to AEK.
A small group of Colo-Colo fans tried to pinch a banner from Antofagasta supporters at half-time of Saturday's Primera División match.