Mata hopeful of title
Dutchman Van Gaal was officially presented to the media on Thursday and has been tasked with returning United to the lofty heights of the Premier League table in 2014-15 after the club finished seventh last season.
Van Gaal arrives at Old Trafford with a respected CV, having won league titles in the Eredivisie (with Ajax and AZ Alkmaar), La Liga (Barcelona) and the Bundesliga (Bayern Munich).
The 62-year-old also led the Netherlands to third place at the FIFA World Cup in Brazil, with an emphasis on swift counter-attacking football, and Spanish midfielder Mata said he was anticipating an exciting season in Manchester.
"It's the start of a new era for the club, with a new manager and players coming in," Mata told MUTV.
"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."
United arrived in the United States over the weekend as part of their pre-season tour and they are set to come up against the Los Angeles Galaxy, Roma, Inter and Real Madrid in the International Champions Cup.
First up for United is Wednesday's fixture with MLS side LA, the club's sole focus as they step up preparations for their Premier League opener against Swansea City on August 16.
"The most important thing is to get ready, step by step and not too hard because injuries can happen," he said.
"It's important for us to prepare physically and mentally for the long season.
"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."