The Portugal forward has been the subject of speculation about a possible return to former club Manchester United, while Paris St Germain president Nasser Al-Khelaifi has publicly stated his interest in the forward.
But Ronaldo has two years left on his current deal in the Spanish capital and, during a press conference in Madrid on Saturday, Ancelotti was quick to praise his top scorer.
"Everyone knows that he is a superstar and a great player," he said.
"The most important thing for the club is that a player of his quality shows the utmost professionalism.
"That is good, especially for the young players who can see a world-class player working with that attitude.
"I am not responsible for the renewal of his contract, but it won't be a problem."
Gonzalo Higuain is another player who has been tipped to head to the Premier League this summer, with Arsenal strongly linked with a move for the striker.
And, while the Italian did not go as far as giving Higuain assurances about his future, he did stress that the Argentinian will have the chance to impress his new manager, who only replaced Jose Mourinho last month.
"I have spoken to the player but it was a private conversation," he said.
"He is currently a Real Madrid player and I am happy to have him here."
Los Blancos also continue to be linked with a move for Tottenham midfielder Gareth Bale, but, when questioned about the Wales forward, Ancelotti played a typically straight bat.
"I am happy with the squad and I don't want to talk about other players out of respect for those who are here," he said.
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