The Red Devils' youngsters were set to play against the Swans in Premier League 2 on Friday.
But the game is now postponed for a later date.
The issue is due to the visitors Swansea having an illness that is spreading through their squad.
It means that United's youngsters will not have a game until March 2nd in Premier League 2.
But they do have the small matter of a friendly game against Club Brugge's youngsters on 20th February.
That match is taking place in lieu of the first teams playing each other in the Europa League.