Mata claims United have, can and will play in the attacking style for which the club became famous under Sir Matt Busby and Sir Alex Ferguson.
After victory in the Europa League final, the Spain star said: “He has changed. It is a different environment, it is a different club and squad.
“This club has always known that they play one kind of football, which is all about attacking and creating chances.
“We are doing that and he is happy with performances. Everyone can see the players are playing with more confidence.
“He is the same person, with almost the same staff. But what has changed is the environment.”