Levski and Slavia Sofia fans clashed at the Georgi Asparuhov Stadium at the end of their Bulgarian First League match on Saturday.
Atromitos hooligans clashed with riot police during their side’s Greek Super League match against Aris on Saturday.
Apollon and APOEL hooligans clashed at the Tsirio Stadium in Limassol during their Cypriot First Division match on Sunday.
Brest and Lorient hooligans clashed in a mass brawl ahead of their teams’ Ligue 1 match on Sunday.
Romanian and Bosnian fans clashed in the stands during their Nations League match at the Giulesti Stadium in Bucharest on Monday.
Flota Swinoujscie and Gwardia Koszalin fans clashed during their Polish fifth division match on Sunday.
Nice and Cologne fans clashed in the stands at the Allianz Riviera stadium before their Europa Conference League match on Thursday.
Borussia Dortmund and Copenhagen fans were seen throwing flares at each other before the start of their Champions League match at the Westfalen Stadium on Tuesday.
Ruch Chorzow fans clashed with stadium security during their Polish Cup tie against rivals Gornik Zabrze on Thursday.
AIK and Hammarby fans clashed in the stands at Stockholm’s Friends Arena after their Allsvenskan match on Sunday.
Young Boys fans came under attack from Anderlecht hooligans in the Belgium capital ahead of their Europa Conference League tie on Thursday.
Fans of Twente and Fiorentina clashed in the centre of the Dutch city of Enschede on Wednesday.