Marca had claimed the Portuguese has agreed a new five-year deal worth €17 million [£14.8m] per year after tax, though Manchester United continues to be linked with a move for their former player.
| REAL MADRID LATEST
|6/1||Cristiano Ronaldo is 6/1 with BetVictor to be named Best Player in Europe
"I cannot confirm that I will retire at Madrid," he told reporters. "I'm not going to confirm anything - I'm just going to do my job like I always do.
"My future - I don't know. At this moment I'm a player of Madrid, the future, I really don't know.
"Let's see what's going to happen - but for the moment, I'm good where I am."
Ronaldo's current deal has two years left to run after joining from United for a world-record £80 million fee in 2009.