Mata has been in sensational form since arriving from Valencia in a £23.5million deal in August 2011. And he has become a firm fans' favourite since scoring on his Chelsea debut in a 3-1 win against Norwich City.
He told the Daily Star Sunday: "It has surprised me because I didn't expect to be so successful so soon.
"When you change the country you play in, you are a little bit scared because you don't know how it will work out.
"But I scored on my debut - and, thankfully, everything has been good since then."