Colombia fans fought each other at the Mestalla Stadium in Valencia during the team’s friendly against Iraq on Friday.
Groningen and Arminia Bielefeld hooligans clashed in the centre of Groningen on Saturday evening ahead of their friendly.
Pecsi MFC and Cibalia fans clashed on the pitch during a friendly match in Hungary on Saturday.
Cagliari and Pogon Szczecin hooligans clashed in the streets of the Sardinian capital after a friendly between the two sides on Friday.
A brawl erupted between Nantes and Brest fans following Friday’s pre-season friendly at the Mane Braz stadium in the north-western French town of Inzinzac-Lochrist.
Club America and Pumas fans clashed on the pitch during a friendly in Santa Ana, California, on Sunday afternoon.
Sporting and Betis fans clashed near the Algarve stadium ahead of their friendly on Thursday.