He told The Daily Star: "For me, they are one of the favourites. They got to the semi-finals last year and have really strengthened in the summer by buying Anderson, Nani, Carlos Tevez and Owen Hargreaves. They have the squad to do it.
"He is United's most important player, he makes most things happen on the field. He is a legend, as is Ryan Giggs. The older players help guide the young players and give them balance.
"Ronaldo is a player who I enjoy watching and he will get even better. He is so skilful and quick but also physically strong.
"Last season it was Kaka with Milan who dominated the Champions League, and this year it could be Ronaldo who does that with United."