Valenciennes goalkeeper Jerome Prior claimed he was bitten in the face during a scuffle at the end of Saturday's Ligue 2 match with Sochaux.
Players from both sides clashed after the final whistle of the 0-0 draw at Stade du Hainaut, with Prior seen recoiling after a coming-together with Sochaux's Ousseynou Thioune.
The 25-year-old shot-stopper left the pitch bleeding from his cheek, but his manager was unable to shed light on the incident post-match.
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"Jerome has a bite on his cheek," said Valenciennes head coach Olivier Guegan after the match. "I was in the dressing room; I didn't see anything.