AC Milan vice-president Adriano Galliani has warned Ronaldo that his fitness problems are placing his future with the Rossoneri in doubt.
The Brazil striker has made just one appearance so far this season due to a succession of injuries and Galliani has hinted the club's patience is beginning to wear thin.
Ronaldo is out of contract at the San Siro at the end of the season.
"He will have to work hard to regain his place," said Galliani.
"Next year we will have six attackers. There are already five, the sixth will be Ronaldo, if he is fit.
"If not him, then there'll be another."
Source : Football.co.uk