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."
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