The former Borussia Dortmund midfielder had reached an agreement with the Red Devils about a move over the summer transfer window and has now finalized a four-year deal with the club.
According to Goal.com, Kagawa made the flight from Japan to Old Trafford to complete his medical at the club and obtain a United Kingdom work permit. After both those details were finished, the deal was finalized and made official.
Manchester United manager Sir Alex Ferguson was obviously pleased with finalizing the deal and is delighted that the 23-year-old is on his way to Old Trafford next season. He said, per The Telegraph:
Shinji is an exciting young midfielder with great skill, vision and a good eye for goal. I am delighted he has chosen to come to United...I believe he will make an impact upon the team very quickly as he is suited to United's style of play...We are all looking forward to working with him...
Kagawa also spoke of his excitement regarding next season:
This is a challenge I am really looking forward to. The Premier League is the best league in the world and Manchester United is such a massive club. This is a really exciting time for me and I can't wait to meet the team and start playing...
Manchester United also posted an official photo of the deal being finalized via their Facebook, as well as Kagawa posing at Old Trafford with his new United jersey.
The Japanese international scored 17 goals and eight assists during his most recent season, which saw him clinch both the Bundesliga and the German Cup with Borussia Dortmund.
United fans and officials alike hope that the addition of Kagawa to the Red Devils' midfield can bring similar success to Old Trafford next season as they seek to win back the English Premier League.
Excited about the signing of Shinji Kagawa?
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