Manchester United have announced on their official website that attacking midfielder Adnan Januzaj has left the club to join Sunderland on loan.
The Belgium international was going to struggle to secure a regular place in Jose Mourinho's squad.
The Portuguese insisted on Friday that the youngster is part of his plans and will return to the club at the end of this season.
Sunderland boss David Moyes was full of praise for the youngster after the transfer was completed.
"Adnan needs to come and do the business," Moyes told Sunderland's official website.
"He will give us a different variation because he can play in two or three different roles, but I have to get him back to the level he was at two years ago.
"He will get plenty of opportunities with us and I believe in him because he's one of the finest young talents I've ever seen, and he was up there with Wayne Rooney when he was an 18-year-old."
He continued: "I'm looking forward to getting him here and I hope the Sunderland supporters see the real Adnan Januzaj, so we will give him every opportunity do to that in the coming year.
"I hope that he shows that [two goals on his first start at the Stadium of Light] in a Sunderland jersey and score goals for us because we're going to need him to create them and score them.
"Adnan will be joining up with the rest of the team in Manchester later today."