Zlatan Ibrahimovic has undergone surgery on a knee injury and will be out up to eight months.

A statement from AC Milan said: "AC Milan announces that Zlatan Ibrahimović underwent an operation on his left knee carried out by Dr Bertrand Sonnery-Cottet, with the Club's Medical Director Stefano Mazzoni in attendance, at the Hôpital Jean Mermoz in Lyon.

"The arthroscopy had been planned for a while to definitively resolve the joint's instability through the reconstruction of the anterior cruciate ligament, with lateral reinforcement and meniscus reparation.

"The operation was a complete success and the prognosis is estimated between 7 and 8 months."

Ibrahimovic is now 40 and is worrying for the future of his career.

"I'm in a situation now where I'm close to the goal line ... so I'm a little bit panicking," he said.

"Because when it stops, what do you do? I know I can do a lot of things, I will have offers from all over the place. But the adrenaline I get on the field, I will never get that [from] something else."