Trouble broke out in the stands of Athens’ Nea Smyrni Stadium following a Greek Super League match between Panionios and Atromitos on Sunday.
Aarau and Servette fans fought at Neuchatel railway station on Saturday night.
Espanyol and Athletic Bilbao fans clashed in the streets ahead of their La Liga match at the RCDE Stadium on Saturday.
A fight broke out between Valencia and Barcelona hooligans before Saturday’s La Liga match between the two clubs.
Rouen and Metz fans briefly clashed ahead of their French Cup match on Monday.
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Six Lazio fans were attacked by Cagliari hooligans ahead of their Serie A clash at the Sardegna Arena on Monday.
Real Zaragoza and Racing Santander fans clashed ahead of their Segunda Division match on Saturday.
PSG and Galatasaray fans clashed in the French capital ahead of the teams’ Champions League meeting at the Parc des Princes on Wednesday.
Two Blackpool fans attacked a Fleetwood Town supporter on the pitch during their League One clash at Bloomfield Road on Saturday.
Wolverhampton Wanderers fans were attacked by a group of Standard Liege hooligans in the Portuguese city of Porto on Tuesday night.