Ronaldo has declared he wants to win the Champions League with AC Milan this season.
The Brazil striker is fit for their clash with Siena and said: "I have not yet won the Champions League, so I will do everything I can to bring it back home with Milan."
On their match against Siena, Ronaldo added: "This is going to be an important game. We are make up for lost ground after a bad start and to win here would be crucial.
"A year ago I was able to give my contribution, this year a little less. I am disappointed at all the injuries I had in my career and think there were many mistakes both from the medical staff and from me.
"Now I hope to get some consistency into my performances because being here at Milan is wonderful and very motivating. I am determined to do well."