Italy wing Mirco Bergamasco has been ruled out for up to five months after suffering a fractured kneecap against Australia.
Bergamasco went down early in the second half of the 19-22 defeat to the Wallabies in Saturday's Test match at Florence amid fears of a rupture, but medics confirmed Sunday the problem was a fracture.
"Medical exams revealed no ligament injury, and the surgery was a complete success," the Italian Rugby Federation (FIR)said.
Bergamasco went to ground with a group of players and almost immediately lifted his arm to signal an injury. He was given treatment for several minutes before leaving the pitch on a stretcher.
Prop Andrea Lo Cicero, meanwhile, left the field in the first half having suffered a blow to his throat and fractures to two ribs. The FIR said that Cicero could be out for several weeks too.