Milan have caused quite a stir after signing Zlatan Ibrahimovic and Robinho during the summer.
"They have reinforced," Ronaldo admitted. "They will be two difficult games, but we mustn't think about our opponents.
"We are Real Madrid and we are not afraid of anyone.
"We will win something, of that I'm sure. I have a very clear feeling inside. We can't keep winning nothing.
"I can't allow myself to bring nothing home for two years. I feel that with a new Coach and the signings that we have made, we are ready to change tack.
"In recent years in the Champions League things haven't gone well but this year it will be different."