Tom Cleverley spent last season on loan at Aston Villa and manager Tim Sherwood had hoped to make the move permanent, but he has opted to link up with former coach Roberto Martinez instead.
Aston Villa had to wait until the Premier League confirmed that they had received the paperwork for the signing before Monday's transfer deadline.
Former Barcelona and Bayern Munich boss Louis van Gaal will get his first taste of the Premier League this weekend and Tom Cleverley claims Manchester United are ready to show the benefits of the Dutchman's work on the training ground.