Fans of Benfica and Dynamo Kyiv clashed in Lisbon ahead of their Champions League match on Wednesday.
Football hooliganism has returned to the Europa League with a bang after a two-month break.
Ajax fans were attacked by Dynamo Kyiv hooligans as they relaxed at a Kyiv pub before a Champions League play-off tie on Tuesday.
Dynamo Kyiv hooligans were involved in a confrontation with cops outside the Volodymyr Boiko Stadium during their side’s clash with Mariupol on Sunday.
Dynamo Kyiv and Besiktas fans clashed before kick-off and during their Champions League match on Tuesday.