Groningen and Arminia Bielefeld hooligans clashed in the centre of Groningen on Saturday evening ahead of their friendly.
PSG fans clashed with riot police in Paris on Sunday after their side lost 1-0 to Bayern Munich in the Champions League final in Lisbon.
On this day in 2012, a riot broke out in the Toumba Stadium before a Europa League match between PAOK and Rapid Vienna.
Osijek fans clashed with police after their team lost to Lokomotiva Zagreb in the last game of the Croatian First League season on Saturday.
Copenhagen and Brondby hooligans clashed in the streets of the Danish capital ahead of their derby match on Sunday.
On this day in 2007, Vetra Vilnius’ Intertoto Cup match against Legia Warsaw was abandoned at half-time after rioting by Polish fans.
Debrecen fans forced their side’s players to remove their shirts following the team were relegated from the Hungarian top flight on Saturday.
On this day in 2005, Zenit St. Petersburg and Spartak Moscow hooligans clashed in a pre-arranged fight before a Russian Premier League match between the two teams.
On this day in 2008, St. Gallen fans rioted at the Espenmoos stadium after their side was relegated from the Swiss top flight.
On this day in 2006, Basel fans went on the rampage at St Jakob-Park after the side’s dramatic defeat by Zurich.
On this day in 2011, AEK fans clashed with riot police at the Athens Olympic Stadium following their Greek Cup final victory over Atromitos.
On this day in 2001, Paris St-Germain and Galatasaray fans clashed in the stands of the Parc des Princes during their Champions League match.