The 26-year-old has rated Ronaldo ahead of team-mate Lionel Messi.
He said: “For now, Ronaldo is No 1. He has so much power – just look at the goal he scored against Arsenal from 50m. And he is quick with the ball at his feet and strong in the air.”
He added: “If Messi helps us to win the Champions League, then he deserves to be known as the best player in the world.”
