The Brazil-born Italy international, 31, picked up a muscle strain on Wednesday and is set to miss at least three weeks.
The victory was probably his last game for the club as his short-term deal expires in the summer.
The former Palermo and Juventus forward has been disappointing since joining La Viola this year, scoring just once in 13 Serie A matches.
There are four matches left as 14th-placed Fiorentina look to consolidate in mid-table after a poor season.
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