The England international midfielder has been troubled with a tendonitis problem for much of the season but he as admiited to being happy with the way the United boss has helped him back to fitness.
"Sir Alex has proved to be the perfect manager. With the injury, he's know when to rest me and when to play me," Hargreaves told The Sun.
"Being a United player is everything I expected, and more.
"The only disappointment has been I'd like to have played more games. Hopefully, that'll change."
"The competition in midfield is great. We miss Paul Scholes at the moment but Anderson is showing what he can do.
"We've plenty of options with Michael Carrick and Darren Fletcher pushing for places. It makes it difficult for the manager, which is a good thing."