Manchester United agreed a fee with Leicester for Maguire last week, making the England international the world’s most expensive defender for £80million.
The England international has now signed a five-year deal with the Red Devils and is expected to wear the No 5 shirt Marcos Rojo ditched a year ago.
Manchester United have now announced the signing of Maguire, saying on their official website: “Manchester United is delighted to confirm the signing of Harry Maguire from Leicester City.
“Harry signs on a six-year contract, with the option to extend for a further year.”
Maguire himself is raring to get going, saying: “I am delighted to have signed for this great club.
“I have thoroughly enjoyed my time at Leicester and would like to thank everyone at the club, and the fans, for their fantastic support over the past two seasons.
“However, when Manchester United come knocking on your door, it is an incredible opportunity.
“From my conversations with the manager, I am excited about the vision and plans he has for the team.