The 18 year old is a product of the brilliant Crewe youth system and is tipped for big things in the future.
He has signed a four year deal with United.
"It really is a dream come true to be signing for Manchester United,”he told the club’s official website.
"I have had a great time at Crewe and I would like to thank them for helping me to develop as a player over the past 13 years.
"I'm excited about continuing my development with Sir Alex (Ferguson) and the world-class players in the squad.
"The thought of making the step up to the Premier League next season is an exciting prospect. I can't wait to get started."