Real Madrid star Ronaldo: I know I can still improve

Real Madrid star Cristiano Ronaldo feels he still has room for improvement.

The Ballon d'Or contender is confident he find more in this game.

"In my head I always think that I can improve. My ambition is to always be better," the 28-year-old said on Cadena Cope.

"Maybe you get to a level which is difficult to surpass, but I always think I can improve everything."

"Perhaps, at this point, I'm better prepared and it could be that this is one of the best moments of my career."

"I have to show a very high level and very good and I hope to maintain it until the end of my career."