Cristiano Ronaldo has accepted criticism aimed at him by Manchester United manager Sir Alex Ferguson.

Ferguson said that Ronaldo had begun to appeal for fouls when stripped of the ball and his actions have caused two recent goals, one against Aston Villa in the league and another against Porto in Europe.

Ronaldo said that Ferguson's words were taken on board and that he is still learning from his mistakes.

"It is not a problem," Ronaldo said.

"I always respect the manager and coaches because I want to learn. If he says that, it is because he thinks it is true.

"But I think I have been playing well and I have scored a few important goals."