Manchester United boss Sir Alex Ferguson has explained his heart-to-heart with matchwinner Cristiano Ronaldo ahead of last night's 1-0 victory over Porto.

He said: "The point I made to Ronaldo was to keep the referees on his side and not turn them against him.

"He's expecting a foul (to be given) every time. He's the best player in the world, he's going to be fouled and sometimes the referee's going to err on the other side. He's just got to accept that. If he does that, then he's a great player."