French winger David Bellion has signed a four-year deal with Manchester United.
Bellion describes joining Man Utd as a dream move
The 20-year-old's contract with Sunderland expired on 30 June, leaving him free to walk away from the Stadium of Light.
Bellion said: "I am really excited to be joining Manchester United. When you are young they are one of the clubs you dream of playing for.
"I am ready to work hard and give 100% to United, and I'm already focused on the new season ahead."
United boss Sir Alex Ferguson, said: "It has been a long process to complete this deal.
"We did not know whether David would go abroad or come to us, and we are delighted he has chosen Manchester United.
"He is a young player with great potential who will fit into the club's
future plans very well."
United were linked with Bellion throughout last season, before Ferguson described the deal as "dead" after having a £1.5m bid rejected in January.
Sunderland wanted nearer £3m for the French Under-21 international, who made an impression in the Premiership with his pace.
Although he departs on a free transfer, the Black Cats may be entitled to compensation under the Bosman ruling, as the player is under 23.
But length of service is paramount in any tribunal and his two-year stay at Sunderland may not be long enough to demand a significant fee.