Universitatea Craiova and Dinamo București fans clashed in the stands prior to kick-off in their Liga 1 match on Saturday.
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.
Santos' Copa Libertadores match with Independiente on Tuesday night was abandoned after the Brazilian club's fans wreaked havoc.
A brawl broke out between rival fans before a Polish lower-division match on Sunday.
Palermo fans fought among themselves in the stands during Saturday's Serie B match against Salernitana.
Biel-Bienne fans were attacked by Young Boys hooligans at a bar before their Swiss Cup match on Saturday.
Sporting Cristal and Universitario supporters clashed inside Lima's Estadio Nacional prior to kick-off in their Primera Division match on Sunday.
Sparta Prague's Europa League second qualifying round tie against Spartak Subotica was briefly halted on Thursday after a group of Sparta hooligans broke onto the pitch.
Trouble flared at the Georgi Asparuhov stadium on Thursday as Levski didn't progress to the second qualifying round of the Europa League.
France fans rioted in central Paris late on Sunday after their national team won the World Cup in Russia.
France fans celebrating their side’s 1–0 victory over Belgium clashed with riot police in Paris in the early hours of Wednesday morning.
Partizan and Crvena Zvezda fans clashed in Belgrade's Zemun neighbourhood this morning before a match between their youth teams.