The Daily Telegraph quoted the Manchester United ace as saying on Spanish Television that he hasn't decided on his future yet.

"I am happy here but let's see what happens after the Champions League final," Ronaldo said.

"I am feeling calm here. I'm happy here but in the future I don't know."

Ronaldo dropped the hint after just few days from committing his future to Manchester United.

He told British media that he intends to see out his contract at Old Trafford. It runs out in 2012.

The Portuguese winger was United's star man this season, netting 31 goals and steering them to the Premiership title and the Champions League final.

Real Madrid are long-time admirers of Ronaldo and they are believed to be ready to bid for his services.

"I have said millions of times that I would love to play in Spain but it’s one thing to dream and another thing for it to be reality," Ronaldo said.

Manchester United play Chelsea in the Champions League final on Wednesday.