"I would sign for another 10 years, until the end of my career," said Ronaldo, adding a rider.

"Nobody knows what will happen in the future, I can't lie and say I will be here another 10 years with Madrid, or that I will never play for United again. We will have to see what the future holds in store for me," he clarified.

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"I am not going to close the door on a possible return to the English Premier League, as I know it well, the players and the atmosphere. I most like Manchester United, but I can't guarantee that I will return, because I am happy at Madrid," said the striker.

Ronaldo admitted he had a close relationship with Manchester United coach Sir Alex Ferguson who, he said, had helped him develop as a player. He also added that he remained in contact with some of his former teammates at the club.

"I am not going to stop speaking to old friends and when I have the chance I speak to Alex Ferguson. He was important for me and it is good to speak to him," said Ronaldo, who explained why he had moved to Real Madrid in 2009

"There is a beginning and an end for everything, what I did at Manchester closed a chapter. I won nearly everything there and I am always looking for new challenges. I didn't join Madrid for money but for the challenge and also to be closer to my family, for questions of language and for the climate," said Ronaldo.