The Italian coach has told the Portugal international to focus solely on his attacking duties because a changed role might effect his impressive goalscoring form for Los Blancos
The Portugal international netted an impressive 34 goals in as many La Liga appearances last term and the Italian trainer feels that a changed role could affect his goalscoring form.
"Cristiano [Ronaldo] doesn't need to do much work at the back. He needs to be ready when the team has the ball," Ancelotti told reporters.
"He has to feel comfortable on the pitch. There's no need to change his position."
The former Paris Saint-Germain coach then went on to discuss his attacking options and insisted that they do not need a new striker after the departure of Gonzalo Higuain to Napoli.
"We've got Ronaldo, who's the best in the world, [Karim] Benzema, [Alvaro] Morata, Jese [Rodriguez]," he continued.
"There are some truly great strikers about elsewhere, but we've got good enough ones here to do as well as possible."
The club remains locked in negotiations with Premier League side Tottenham over what could be a world record transfer for midfielder Gareth Bale.