Chelsea signing Mata confident leaving Valencia on best terms
Mata moved to Chelsea earlier this week for €28 million.
"In no time I figured this out, but when you get a club of this nature interested it makes you think whether you're ready for such a move.
"I came at zero cost and go for big bucks.
"I will leave full of sadness, but the payoff for the club and the step I take learning about another country and another league, I think it was time."
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