Mata has scored three goals in Chelsea last two matches as they look to build on their Champions League and FA Cup victories last season and Mata believes that the club can continue that success after the summer signings of Oscar and Eden Hazard.
The 24-year-old said: "Last year, we won the Champions League and FA Cup, playing as we played.
"Now I think we can play even better with Oscar, Eden Hazard and whoever.
"All that we can do is try to play our best and that is what we are doing. I want to improve. I feel I can still do better."
Chelsea are currently top of the Premier League table.