The former Valencia attacker has been in blistering form at the start of the season and is enjoying playing alongside Oscar and Eden Hazard in the Blues' new style of play
The Spanish playmaker was recently named October's Premier League Player of the Month after enjoying a fantastic run of form, and he is relishing the increased attacking freedom given to him this season.
Speaking to Absolute Radio about his new team-mates Oscar and Hazard, he said: "We practice in the training as well, because I mean we're playing with freedom, Ed and Oscar and me, we all three love to play with the ball, and our relationship with each other is very good.
"But we know that when we are defending we have to be in those free positions to defend, so attacking, we play with freedom, but talking about defend we have to be very, very straight with the team."
Despite winning the Champions League last season, the Blues were criticised for their style of play, but Mata has enjoyed playing under Di Matteo after he took over from Andre Villas-Boas.
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"This year we have more midfielders, more quality players, and we are playing different from the last year. But I think because of the new joinings, talking about manager Di Matteo he is a very, very good manager, he's so clever, he knows very well how is playing and managing for Chelsea.
"He used to be a legend here. So it's very important for us to have a manager like him."
The former Valencia man is also relishing facing Liverpool in Sunday's clash at Stamford Bridge, as the west London club now sit a point behind Manchester United following last weekend's results.
He continued: "Always playing against Liverpool is a tough game, and I realised last season when we lose in the Capital One Cup, in league as well, playing in Anfield, and I think we have to be strong at home.
"We are feeling really good playing in Stamford Bridge with our supporters, with their support, and it's going to be tough, but I think if we want to win this Premier League we have to be at the level in these kind of games, which are massive rivals."