Despite regular criticism, the Chelsea midfielder is confident he has improved as a player in his first 12 months with the Blues, but still has the ambition to become an even better player.
"It was pretty much as I expected it to be: difficult," he told Germany´s Frankfurter Allgemeine Zeitung. "I went in search of a new challenge, and I found one. Highs and lows are just part of it, but that is good because that is how I can develop. I have not lost any of my strength, in fact, I have developed further while in England."
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