The Manchester derby is one of three United away fixtures in December that have been rescheduled for live TV.
The Reds will visit the Etihad Stadium to face City on Sunday 9 December (13:30 GMT).
United’s trip to Reading will kick off at 17:30 GMT on Saturday 1 December, while the game at Swansea is now on Sunday 23 December (13:30 GMT).
The derby and Swansea clashes will be broadcast live on Sky Sports, with ESPN screening the Reading encounter.
More: Full fixture list
Reading v United
Saturday 1 December, 17:30 GMT
City v United
Sunday 9 December, 13:30 GMT
Swansea v United
Sunday 23 December, 13:30 GMT