Feyenoord fans clashed with police at club’s training ground in Rotterdam on Saturday morning.
Young Boys and Feyenoord fans clashed briefly in the Swiss capital on Thursday ahead of their Europa League fixture.
Feyenoord and Metalist Kharkiv fans clashed in the eastern Ukrainian city of Kharkiv ahead of the Dutch side’s Champions League match with Shakhtar Donetsk.
Feyenoord fans went on the rampage in the streets of Rotterdam on Sunday after the side’s defeat at Excelsior.
Willem II’s Eredivisie match with Feyenoord at the Koning Willem II Stadium this afternoon was suspended for several minutes as fans clashed in the stands.