A Burnley fan was stabbed, and four others were left injured outside Olympiakos' Georgios Karaiskakis Stadium ahead of their Europa League clash, the club has confirmed.
More than 900 Clarets supporters travelled to Piraeus in Greece for their first leg 3-1 defeat on Thursday night, with the club offering transport to and from the ground to avoid such incidents.
However, according to a statement via the north west outfit's official website, despite the majority of the travelling fans being "impeccably behaved", five were left injured ahead of kick-off.
"The vast majority were once again impeccably behaved with the coaching operation to transport supporters to the ground put in place by the club again a great success, as it was in the previous round in Istanbul," the statement read.