The Fiorentina striker faces a spell on the sidelines due to the injury but avoided tearing his cruciate ligament again.
The Italy international was forced to leave the pitch in Sunday's 1-0 Serie A win over Livorno after a challenge from center back Leandro Rinaudo and Fiorentina said after the game that the injury sustained had been to the same knee that had caused the Serie A’s leading scorer problems in the past.
Rossi missed the majority of last season because interior cruciate ligament injuries to the same knee, but his latest physical misfortune is not as severe as initially feared.
"Test carried out on Monday morning have confirmed that Giuseppe Rossi has suffered a second-degree sprain on the medial collateral ligament of his right knee," a statement on the club's official website reads. "Professor Richard Steadman, who performed surgery on Rossi's second cruciate ligament injury, will further examinate his situation over the next days to assess the exact extent of the injury."
It's unknown as of yet how long the 26-year-old will be out of action.