Supporters on the Talking Reds forum took little time welcoming the Japan international to the club and embracing his arrival from German champions Borussia Dortmund after a move was agreed with the Bundesliga outfit and the player.
MUFC4Life: Fantastic signing. Exactly the sort of player we need! Welcome to the greatest club in the world, Shinji.
Red&White: Perfect news in the morning, made my day! Welcome Shinji!
Mandix: Have been waiting for such a fantastic piece of news for more than a month now. I am so positive you will make a long-lasting impact at United if your exploits with Borussia are anything to go by.
manutd4eva_Rahul: I'm over the moon we finally have a genuine goalscoring central midfielder. I have no doubts that you will flourish and contribute to this exciting brand of football.
IamConnor17: What an amazing signing. Shinji is one of the most talented players in Europe and he is only 23. Can't wait to see him for us next season. One thing for sure is he will make our team much better.
LooneyRed: This lad is top notch. I have followed him since last January and he's probably the best playmaker in Germany for that time.
Shirl: About time. I have not been excited and relieved about a transfer since Ronaldo was signed. All due respect to Hazard but Kagawa was always my preferred choice.