The Real Madrid attacker has denied any knowledge of whether his Portuguese coach will step down at the end of the season, and refused to discuss what goes on in the dressing room

Real Madrid star Cristiano Ronaldo has revealed there was an issue between him and head coach Jose Mourinho, but it has now been resolved.

In September 2012, Ronaldo had explained to the press he was "sad" at Santiago Bernabeu, which caused speculation to mount about his future with the Liga club.

However, the Portugal international insists his troublesome period with the former Chelsea coach is in the past, and admitted he is unsure how long Mourinho will remain in charge at Madrid.

He told AS: "I don't know, I think he'll stay on at least until the end of the season, because he is a coach who always wants to win and we still have some challenges left.

"After that he will decide what is best for him, for the players and the club. But I don't know what he or the club thinks.

"It's a very personal issue [what happened with Mourinho], but it's been resolved now and everything is fine. What happens in the dressing room stays in the dressing room."

Iker Casillas’ girlfriend Sara Carbonero has claimed the Madrid dressing room had a difficult relationship with Mourinho, but Ronaldo refused to go into detail about what might be going on behind the scenes at Los Blancos.

"There are some things I am not fit to talk about but it's a delicate situation and I don't think it was the right thing to do," he said.

"However, people are free to say what they want even though I think that it was not good, because the business of the dressing room should stay in the dressing room and if you know something you shouldn't report it."