Ronaldo has confessed he misses the guidance of his former United manager.
And he reckons Fergie is still tough with his players despite the fact he will be 71 in December.
He added: "He is very tough. I think he cannot be like that because, how old is he? 70? It's not good for his heart.
"He's still tough, strong, I remember him the first time I saw him he was with the same power."