Queensland Reds flanker Hugh McMeniman is expected to be out of action for up to six months after suffering an ankle tendon injury.
McMeniman, who played nine Tests for Australia last season, suffered the injury during a routine training session.
Scans have now revealed he has suffered a tear of the peroneal retinaculum, which binds the ankle tendons, which will require an operation to repair and a lengthy period of rehabilitation.
Reds coach Phil Mooney said: "It was one of those innocuous injuries where in warm-up drill he changed direction and felt something in his ankle go.
"It is the tendons in his ankle that are separated and it requires surgery," Mooney said.
McMeniman looks set to miss the Wallabies' home Tests against Italy and France in June, and the Tri-Nations tournament against South Africa and New Zealand the following month.