Former AC Milan coach Arrigo Sacchi admits he's been impressed by Chelsea midfielder Hakim Ziyech at the World Cup.

The Morocco international has been linked with Milan ahead of the January market,

Sacchi told La Gazzetta dello Sport: "I also saw him at the World Cup against Spain. He has great technique and speed. I must admit that when he was at Ajax he was believed to become an authentic champion, instead his ride then slowed down. At Chelsea, for example, he is not always among the starters.

"I repeat: he is a player with remarkable qualities, but to be successful the technique is not enough, the feet are not enough, dribbling is not enough. It takes the head. I, as a person, do not know Ziyech and therefore cannot express a judgment.

"But I trust (Paolo) Maldini, (Ricky) Massara and (Stefano) Pioli who, so far, have done little, if not very little, wrong. If they have seen him and followed him, and have convinced themselves that him can be functional to the project, then they do well to buy him.