He told the Daily Mail: "I am concentrating on the Premier League and Champions League, but my ultimate aim is to be the best in the world. I work every day towards that, but only God knows if, one day, I will eventually get that Ballon d'Or, which is so important to me."
The Portugal winger added: "I am living through one of the best periods of my career. I'm in good physical shape and I'm working hard. Thanks to that, the goals and results have arrived."