Mata has signed a five-year contract with the Blues and could make his debut on Saturday against Norwich.
“Right from the first moment there have been good feelings all around me,” Mata told Chelsea’s official website. “Training has been great and the players are a great group to train with.
“Valencia was a big club anyway but I have left to join a bigger club and it is all about the opportunity to win trophies and I have that here.”
Mata admits Chelsea boss Andre Villas-Boas convinced him that he should move to Stamford Bridge.
“He said he wanted Chelsea this season to play more attacking football, and that I would be a big part of that,” the player explained. “Villas-Boas is someone who won almost everything last year and we are both here with the idea of winning lots this season.
“The plan is that I can play on either flank or even in the middle playing in between the lines of midfield and attack. I like to keep the ball and use it well, I am an attacking player and above all I like to set up goals and score them also.
“I want to adapt as quickly as possible to my new surroundings, my colleagues and this league, and I would love to win a trophy in my first season. If it can be the Premier League then great.”
“Fernando (Torres) got me excited about the thought of coming here,” Mata revealed. “He said it would be good for me here and that me and him together could be good. I also talked to my family and friends about it as well.”
