AC Milan striker Ronaldo is fearful he may have to retire after rupturing a tendon in his left knee, claims club owner Silvio Berlusconi.
The Brazilian international fell awkwardly while challenging for a ball in the air with Jose Vidigal, shortly after replacing Alberto Gilardino in the second half in a Serie A game against Livorno on Wednesday evening

"He fears for his career," Berlusconi told Italy's RAI TV.

"I called him last evening and told him to believe in himself. He has enormous physical potential."

Ronaldo is expected to see the same surgeon who dealt with him for a similar injury in 2000.

"As a 31-year-old, he's very young," added Berlusconi of the Brazilian.

I don't want to say it's the end of his career because only time can decide

Milan coach Carlo Ancelotti

"He has an extraordinary physique, and I think within a few months he could return to being the champion that we all know him as."

The striker is expected to be out for 9 months at least.

"I don't want to say it's the end of his career because only time can decide - all we can do is stand by him," said Milan coach Carlo Ancelotti.