Rumours that the Portuguese superstar has been unhappy at the Bernabeu have been circulating for several months and have only intensified as Real have fallen 18 points behind Barcelona in the league.
But the 27-year-old is adamant that he will not walk away from the club - at least not yet.
"I want to see out my contract at Real Madrid: I'm very clear about that," he told FIFA's official website.
"After that, well, I don't know what'll happen in the future."
Ronaldo's contract expires in June 2015, at which time he will be 30. But if he continues to perform anywhere close to how he has in the last couple of years he would be guaranteed a vast sum to change clubs for the final spell of his career.
The player insists that he is content in Madrid, however.
"Honestly, yes," he said when asked if he is happy. "I'm doing something I like, something that I enjoy. I know how fortunate I am and I feel very fulfilled."
Real coach Jose Mourinho has also appeared unhappy this season, with fans turning against Ronaldo's compatriot.
"People do protest and you have to respect that, though I think they should be a bit patient with him," Ronaldo said.
"To me it’s very clear that Mourinho always wants what’s best for the club and will fight to the death to defend it. All of us who work alongside him know that, but you’ve still got to show respect for the fans’ opinion.
"In my view he’s the best coach in the world, he’s got loads of experience and has won everything there is to win."
Ronaldo also played down the importance of winning La Liga this season - admittedly a prospect that is already all but out of sight - and said that the Champions League was always his club's main focus for 2012-13.
"Every Madridista wants that tenth European Cup – we're more than aware of that. Last season we fell just short, which was very frustrating," he said.
"Fortunately we've got the opportunity to set the record straight this year, though the fact we face Manchester United next makes it more difficult. It's not going to be easy and I reckon the odds are about 50-50, but I'm still very confident."
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