Real Madrid star Cristiano Ronaldo admits Champions League elimination at the hands of Manchester United will give him sleepless nights.

The Portugal star is preparing to return to Old Trafford for the first time since a world record £80million move to Madrid in 2009 when the two clubs meet again on March 5 with the tie evenly poised at 1-1.

And Ronaldo, 28, revealed just how deeply he is affected by defeat, saying: "If we're talking after a big game, a semi-final or final of a major tournament, obviously I do not sleep well after losing.

"And not just the same night either - even for the next two or three. But losing is one of the drawbacks of our profession, even at Real Madrid. It shouldn't happen, but it does."