Kagawa has joined the United squad in Tokyo this week.
"I'm very happy to be a member of Manchester United and to be playing in Japan for them," Kagawa said. "I'm looking forward to meeting the fans tomorrow and I hope we have a very good game. I'd like to give them my very best.
"Today I met David Moyes for the first time. We had a good talk in the car. We still need to spend more time to get to know each other but I'm looking forward to building our relationship. As a player, I want to give my best in each game and give a good impression to the manager."