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.
Colo-Colo and Santiago Wanderers fans clashed in the stands during their Chilean Super Cup final on Friday.
RAAL La Louvière fans attacked Francs Borains supporters following Saturday's defeat in the Belgian Third Amateur Division.
FC Köln hooligans managed to pinch a flag from Borussia M'gladbach ultras during the half-time break of Sunday's Bundesliga match.
As 2017 draws to a close, it's time to take a look back at some of the craziest and most interesting moments of the year.
Two groups of Partizan fans clashed in the stands during their derby clash against Crvena Zvezda on Wednesday night.
AEL Limassol and APOEL fans invaded the running track at the Tsirion Stadium and attacked each other during a match on Monday night.
A Bulgarian league match between Lokomotiv Plovdiv and CSKA Sofia was halted for around 20 minutes on Sunday after a massive brawl broke out between rival fans.
A group of Dinamo București fans tried to enter the directors' box of the Dinamo Stadium during their Liga I match with Viitorul on Monday.
Marseille fans clashed with riot police on the streets of the port city ahead of their Ligue 1 match against arch-rivals Paris Saint-Germain on Sunday.
Fighting broke out between rival fans during the half-time break of the Romanian Liga II match between ASU Politehnica Timisoara and UTA Arad on Sunday.