"Ronaldo said it was exactly the same thing as last time," said Leonardo, referring to the time when Ronaldo ruptured the tendon in his right knee in November 1999.

Ronaldo underwent an X-ray at hospital and Milan's club doctor Jean-Pierre Messerman later confirmed he had indeed suffered the same injury that inflicted his right knee eight years ago.

Another doctor, Walter Pascale, however, did have some good news for Ronaldo.

"Surgical tenchniques to repair this kind of injury have improved a lot over the last eight years," he said.

"If things go as they should he should get back to his best. However it's difficult at this time to say for how long he will be out."

Ronaldo will go under the knife in Paris on Thursday where he also underwent surgery in 1999.

He fell awkwardly just three minutes after replacing Alberto Gilardino in the second half on Wednesday.

He was challenging for a ball in the air with Jose Vidigal, although the move resulted in a penalty to Milan which Andrea Pirlo converted to level the scores.

"I heard a horrible sound, like a bang, it was a strange sound," said Livorno goalkeeper Marco Amelia, who was close by when Ronaldo fell to the ground.

The last time Ronaldo suffered the same injury he managed to make his comeback in April 2000 but lasted only seven minutes before reinjuring his knee.

It was 20 months before he made a proper comeback for the 2002 World Cup, during which he finished as top scorer as he guided Brazil to a record fifth triumph.

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