He said: "I have to trust my judgment and know I will make mistakes. I always say you have to have a relaxed attitude because in the right hand there is a bomb and in the left there is a hand grenade. If you are wrong, it can explode in your face.

"Maybe one year ago, Ronaldinho was the best player in the world. Is he today? No. It is as simple as that.

"It is like in tennis. You can be No 1 in March and No 10 in November - footballers are the same. I don't want to ruin the work I have done by signing someone for £30m, and he is not necessarily better than what you have got.

"A superstar is someone who performs better than another player on the pitch. Just because someone speaks three times on television, it doesn't make him a superstar. Let's see what kind of performance he puts in."