Chelsea midfielder Mata: Real Madrid always special to me
Asked if a return to the Spanish giants was a challenge he had set himself, he said: "I only have good words for Real Madrid. I was there for four years and they brought me up, both as a player and a person.
"I have many friends there and I'm very grateful to the club. But I've spent two great years in London and the only thing I'm thinking about now is continuing to enjoy this league and this city that I love."