The Special One penned a three-year contract with the English club in June, and Rooney is excited to begin working under the former Chelsea boss.
In a recent interview, the England international told the club's official magazine about his excitement for the 2016/2017 campaign which begins on August 13.
"I'm really excited to be working with Jose this season as he's one of the best managers in the world, and it's an exciting time for Manchester United."
Jose Mourinho shakes hands with Wayne Rooney during his first season in charge of Chelsea.
The 30-year-old forward only had words of praise for his new boss.
"I've always respected him both as a man and a manager, he's a nice guy and one of the most successful managers of all time.
"I like to think I'm always motivated as a player but I'd be lying if I said I wasn't a bit more motivated when a new manager comes in. I'm sure all the lads will be happy to be working under Jose and also eager to impress.
"I've played against many Mourinho sides over the years, and I can't remember any easy games, so I think that says it all.
"His teams are always hard to beat, tactically disciplined and, most importantly, successful.
"One of the biggest assets will be his experience. He's managed a lot of successful teams throughout his career and all that experience will be vital."
The Red Devils will start their season against Premier League champions Leicester City in the Community Shield on August 7 before traveling to Bournemouth for their opening league game.
