The 24-year-old has moved to the Championship club for an initial month after first-choice keeper Adam Bogdan picked up an injury in training.
Neil Lennon's side host Wolves tomorrow and Amos will be battling with veteran keeper Andy Lonergan for a start.
Amos came through the youth ranks at Old Trafford but he has made just one Premier League appearance for the club.
He played three times for England's Under-21 side and has enjoyed loan spells at Peterborough, Molde, Oldham, Hull and Carlisle.
Starsport revealed last week that United boss Louis van Gaal was planning to show Amos, Anders Lindegaard and Sam Johnstone the exit door.
