Manchester United star Cristiano Ronaldo says the boos from opposition fans only inspires him to do better.

"I like people whistling and booing!" he said. "It's normal for fans to do that. There's nothing I can do and it doesn't matter anyway.

"I have to concentrate on the game, so I don't think about that sort of thing. On the pitch I'm a target, but it is difficult to avoid these things. I don't believe that people want to hurt me on purpose.

"In my experience, the game just doesn't happen that way. Truthfully, I've never had any serious problems."

Ronaldo is more worried about getting United's title push back on track after the defeats to Liverpool and Fulham.

He remains calm about United's wobble and would love to make history by winning all five trophies this season.

"All the guys have to continue playing like we know we can," he told Zoo magazine. "But no, we can't relax. I know I don't like to.

"I've a long road ahead of me and I want to be in this position, winning awards and trophies while I can.

"Every game is important because if we win, it improves our confidence. I'm at a club that guarantees trophies and that makes me happy. When we compete for a cup, we know we can win it.

"Last year we did the double of Premier League and Champions League and this year we have a chance to win five.

"We're doing well in all competitions and it would be incredible if we could win them all. We have to continue working as we have been."