The Italian coach says that the Portuguese star is fundamental to the club going forward as he is the most impressive player in los Blancos' squad
The Italian coach, who took charge of Madrid for the first time in their 6-0 friendly thrashing of Bournemouth on Sunday, has had to fend off questions about the Portuguese star.
Ronaldo, who has two years remaining on his deal, has been persistently linked with a move away from the capital-based outfit, with Manchester United and Paris Saint-Germain the main contenders for his signature, but Ancelotti has denied that the forward will be leaving anytime soon.
"I think Ronaldo is the most important player in this team because he is the player with the best quality," he told reporters.
"I think we will help him every time to do his best because if he does that every time we have a great opportunity for this season.
"His future is at Real Madrid, there is no question about this."
Madrid put on an exhibition display as they put six past Bournemouth, with Ronaldo grabbing a double while Sami Khedira, Higuain, Angel Di Maria and Casemiro all got on the scoresheet, but Ancelotti feels that there is still more to come from his side.
"The most important thing is that the team worked hard and players like Cristiano Ronaldo, Ozil, other important players and youngsters played with flair in attack and performed well," he explained.
"We had problems at first but had some good moments; we controlled the match and played well. We have high calibre players with flair and I am very happy with the squad.
"The first match went well, our aim is to play good football, we have quality and we had a few good moments, some not so good but that is normal, it is the first match and I'm happy because the team worked hard. Naturally, we have to improve but it is logical after one week of training."
Ancelotti was also not afraid to try out different players in different roles, with Ozil and new signing Isco forming a partnership in midfield.
"It was an experiment but I believe quality players can play together," he added. "It is important to find a balance between attack and defence, which is the most difficult thing. I think we need time for that and we will eventually get there."