MILAN, Nov 30 (Reuters) - Ronaldo is out of AC Milan's home game against Juventus on Saturday (1930 GMT) after suffering a calf problem while warming up as a substitute during Wednesday's 1-1 draw at Benfica in the Champions League.
'I am out, but still believe in me,' Ronaldo told Friday's Gazzetta dello Sport.
The Brazilian made his first appearance of the season last weekend after missing over six months with leg injuries.
Milan hope to welcome back midfielder Massimo Ambrosini, who missed the Benfica match through suspension and was also carrying a slight knock.
Second-placed Juventus have a slight injury doubt over winger Mauro Camoranesi while Alessandro Del Piero could again be consigned to the bench because of David Trezeguet and Vincenzo Iaquinta's good form.