The 22-year-old has now accepted a move to Meadow Lane after manager Paul Ince received a favourable report from United manager Sir Alex Ferguson.
"He's the quick striker I've been looking for," said Ince in the Nottingham Evening Post. "He's been at Preston for the last few weeks, but we steamed in there and have got a deal signed.
"It's a chance for him. We've given him a platform to come in and score goals and show what he can do, with a view to a permanent deal here.
"I spoke to Sir Alex about him because he was at Man Utd and he told me he's a good player.
"He was very highly rated at Man Utd and played for England at Under 17, 18 and 19s, so he will be good for us. He has probably lost his way, but he's got potential and a lot of ability."