He told Sport: "Mbappe is having a difficult start, but I always said that he would be a successful player at Madrid, a goalscorer and an outstanding figure. He has the talent to be the next best player in the world, and he's at the best club in the world in terms of titles and history. The adaptation takes some time, but I'm sure he will be a key player and a great candidate for the Ballon d'Or in the future."