Goal revealed on Thursday morning that the 36-year-old had been presented to the players at their Carrington training ground, and the Red Devils have now confirmed he has joined the Old Trafford backroom staff.
The former England international spent 10 years at United after making his debut at the age of 18, winning six Premier League titles, three FA Cups and the Champions League between 1995 and 2005.
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"I have known and worked with Philip for eight years and in that time I have come to know his dedication, ability to lead and appetite for hard work," Moyes stated in a press release.
"In addition, of course, he understands the club very well and I think his addition to the coaching staff will be a valuable one.”
Neville spoke of his delight at returning to his boyhood club, saying: “When I retired from football, I knew that I wanted to continue in the game; it’s something that I have been preparing for over the last few years.
"So when David called to give me this opportunity, I couldn’t resist. I gave my all when I played for Everton but it is no secret that this club is in my heart.
"I’ve really enjoyed working with David and his staff as a player and I think that, together with Ryan, we can make a real contribution to Manchester United.”
Neville joins assistant manger Steve Round, goalkeeping coach Chris Woods and coach Jimmy Lumsden in following the Scottish manager from Goodison Park, who has also given Ryan Giggs a player/coach role.