A Burnley fan was stabbed before the first leg of a Europa League tie against Olympiakos in Athens.
The man required stitches to a leg wound and received treatment at the stadium. It is understood four others were injured.
More than 900 Burnley fans travelled to Greece for the game; 22 were held by police for being drunk and disorderly.
Burnley lost the game, the first leg of the Europa League play-off round, 3-1. The second leg takes place on Thursday.
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