Fiorentina striker Giuseppe Rossi broke down during last night's 2-2 draw with Parma.
Rossi limped off with a muscular problem after just 37 minutes.
Viola coach Vincenzo Montella said: "I haven't spoken to him yet, but we'll run the tests tomorrow and see. It's a shame, as he was in great shape. I was already thinking of not taking him to Ukraine against Dnipro in the Europa League, but now that decision has been forced upon me."
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