Real Madrid forward Cristiano Ronaldo has been grabbing all the attention as his team prepares to face his former side Manchester United in the Champions League in what promises to be a one-for-the-ages tie.

According to the Portuguese superstar, while re-signing for Manchester United can never be ruled out, a move to Manchester City would be extremely unlikely.

Ever since moving to Real, Ronaldo has been breaking one record after another for his club and it would have been many more Ballon d'Or's had it not been for a certain Barcelona wonder called Lionel Messi.

While there is little doubt about the fact that Ronaldo is currently one of the two best players in the world, a move back to Old Trafford has always been mooted, especially after he revealed he was "sad" earlier in the season.

While Sir Alex Ferguson recently admitted it would be next to impossible to bring back Ronaldo due to the financial implications, there is another Manchester club to whom money is no object.

But United fans need not worry too much though, because as far as Ronaldo is concerned the chances of him moving to City are extremely slim.

"The future? I don't know -- only God knows the future," Ronaldo told The Sun.

"I'm not going to say it is impossible, because in football the impossible doesn't exist. But I can say it would be very, very, very, very, very, very, very, very, very, very, very, very difficult to play at Manchester City. My heart's in Manchester United, that's why.

"I can't say I'm never going back to Manchester United either -- but I can say I'm good here in Madrid and I want to be here."

Ronaldo has sometimes been accused of being a little vain, with some people suggesting it takes the 28-year-old a full half hour to just get his hair in place before the start of a match. The Real Madrid man, however, rubbished those insinuations.

"I don't stand in front of the mirror for 30 minutes. I promise the maximum is one minute, I swear," he added. "When you have hair like me it's easy to style it!"

Ronaldo did get into a bit of a problem when he crashed his Ferrari in 2009, and the prolific forward was just happy to get out of the accident in one piece.

"I didn't care about the car to be honest -- I cared about my legs! When I climbed out I smiled," he said. "I thought, 'It's OK, I'm good.'

"The car is not important, your life is the most important."