The Spanish midfielder, who became the club's record signing during the January transfer window, is part of the squad currently in the United States for the team's pre-season tour, which is their first under the former Netherlands coach.
"This is my first pre-season with United and I'm enjoying it, the journey was good, the hotel is nice and the training ground is great. It's the start of a new era for the club, with a new manager and players coming in," The Mirror quotes Mata as saying.
"I'm really happy with the manager's style of football and hopefully at the end of the season we can celebrate something, which would be amazing for him and for us.
"We're focused on improving and trying to learn from the manager, to play at our best level during the season. The main idea is to play as a team and compete for titles."
United begin their tour with a match against Los Angeles Galaxy on Thursday morning.