Giuseppe Rossi suffered a ruptured cruciate ligament at the weekend - his club has announced.
"The medical examinations to which Giuseppe Rossi was subjected showed a rupture of the anterior cruciate ligament in his left leg,” the official statement read.
“It was an injury sustained during the match against Eibar. The player will require surgery and will be out for no less than six months."
Rossi suffered from the similar injuries in 2011 and 2013, but this time he injured his left knee.