Giuseppe Rossi could face a lengthy spell on the sidelines after Serie A's top scorer suffered a knee injury during Fiorentina's 1-0 win over Livorno.
Ex-Manchester United man Rossi has been predatory this season and has 14 goals to his name, putting him ahead of all others in Italy.
But the American-born hitman's injury woes have repeated after he went down under a challenge from Leandro Rinaudo.
"Fiorentina have to announce that Giuseppe Rossi suffered a sprain to the knee that has previously been operated on following a tackle by Leandro Rinaudo. There will be more tests tomorrow," a statement from Fiorentina reads.
Rossi's cruciate ligament has been vulnerable throughout his career and has been damaged twice in the past, causing long layoffs.
If Fiorentina's worst fears are confirmed then they may be without Rossi for the rest of the season and his involvement in the World Cup is also in doubt.
"Beppe, I hope it isn't anything serious! Crossing my fingers for you... hug," tweeted fellow Azzurri star Ignazio Abate.
Under-fire Livorno man Rinaudo sought to defend himself but also apologised for the fateful tackle.
"It was a normal tackle but there's so much noise about it because it's a player like Giuseppe," he said.
"I didn't get to apologise to Giuseppe because I was immediately accosted by Fiorentina players. However I will call him to do so."
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