England Under-18 star wants Premier League action after completing move from Crewe.
Manchester United win race to sign Nick Powell
The 18-year-old's £4million (Dh22.9m) move from Crewe was finally confirmed yesterday after weeks of speculation Sir Alex Ferguson was targeting the youngster.
The deal marks United's second piece of transfer business this summer - having already signed Shinji Kagawa from Borussia Dortmund.
England Under-18 international Powell will switch to United on July 1 on a four-year deal - but may yet be loaned out next season to get more experience.
For now, though, Powell is likely to join the Old Trafford side on their pre-season tour of South Africa and China.
"It really is a dream come true to be signing for Manchester United," said Powell.
"I have had a great time at Crewe and 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 and the world-class players in the squad.
"The thought of making the step up to the Premier League next year is an exciting prospect.
"I can't wait to get started."
It remains to be seen whether Powell will be selected in England's squad for this summer's European Under-19 Championships.
However, given his annoyance at the potential disruption caused by the Olympics later this summer, Sir Alex Ferguson would presumably be unimpressed at Powell's absence for a tournament that runs from July 3-15 in Estonia.
Ferguson is delighted with his latest capture, which comes shortly before Paul Pogba's anticipated departure for Juventus.
"We have scouted Nick for months now," said manager Sir Alex Ferguson. "He is an exceptional talent and has been schooled well at Crewe.
"I'm delighted he has chosen to come to United.
"He has a lot to offer and we are all looking forward to working with him."