United are adamant the 23-year-old is not for sale, but speculation about his future persists and the player himself admitted after helping Portugal open their Euro 2008 campaign with a 2-0 win over Turkey that he did not know where he will be plying his trade next season.

"I still don't know where I will play, I have not decided yet. I will talk after the European Championships," he said in quotes reported by Spanish newspaper Marca

Ronaldo is adamant he is not letting the situation distract him from helping Portugal have a good tournament, though.

"I have convinced myself that I cannot worry about this, so I am calm," he added.

Ronaldo was handed the Portugal captaincy during the second half of their victory over Turkey in Geneva, taking over the armband from Nuno Gomes.

On that, Ronaldo said: "I've already been captain on a few occasions and, to tell the truth, the responsibility is always the same, but I am not going to lie and say that I don't like being captain of the national team."