Police said a scuffle broke out following the final whistle Sunday and then escalated into a brawl between members of the French team and a team from Berlin.
The victim was struck in the head or neck area and collapsed, police said. He was treated by emergency medical personnel at the scene and taken to a hospital.
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The exact circumstances of the fight were still under investigation. Police have asked for witnesses who may have video of the brawl to come forward.