MILAN - A knee operation undertaken on AC Milan and Brazil striker Ronaldo went smoothly on Thursday, according to his medical specialist in Paris.

AC Milan's Brazilian forward Ronaldo holds his face while is carried out during their "Serie A" football match AC Milan vs Livorno at San Siro Stadium in Milan, on February 13. Ronaldo, who faces a major battle to save his career, underwent his third knee operation in Paris on Thursday. [Agencies]

The three-times World Player of the Year, who ruptured a ligament in his left knee on Wednesday, was treated at the Pitie-Salpetriere hospital in the French capital.

Knee specialist Gerard Saillant, who oversaw the operation and performed surgery on Ronaldo's right knee eight years ago, told La Gazzetta dello Sport's Web site (www.gazzetta.it): "The operation lasted around two hours and took place without any particular problems.

"It was the same injury as the previous time and for this reason the operation was of the same type.

"Now Ronaldo will have to go through nine months of rehabilitation."

Asked if the Brazilian would play again, Saillant replied: "It will depend on him."

The 31-year-old was carried off in tears after going down heavily during Wednesday's 1-1 Serie A draw at home to Livorno.

Ronaldo, who has hardly featured this season because of a series of injuries, had only come on as a substitute three minutes earlier.

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