Ronaldo sustained two bad injuries to his right knee while playing for Inter Milan in 1999 and 2000 but recovered to help Brazil win the 2002 World Cup.
He went on to play for Real Madrid before joining AC Milan in January 2007.
"We're all very sad and worried about Ronaldo," said Milan coach Carlo Ancelotti. "I don't want to say his career is over because only time can put the word end to his career.
"His team mates left the stadium quickly to reach the hospital to check on his condition. Being close to him can help him cope at such a delicate moment of his career."
Milan president Silvio Berlusconi said he believed Ronaldo would be able to resume his career.
"He still has an extraordinary physique. I'm confident in some months time he can return to be the player we all know," Berlusconi told Rai television.
Ronaldo is the all-time leading scorer in World Cup finals with 15 goals in three tournaments.
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