The forward is rumoured to have signed a five-year deal with the Liga giants, according to reports in Spain, but he has refused to be drawn on his continued stay at the club
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.
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"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.