The Dummett news will doubtless prompt further speculation that United could attempt to bring former loanee Jetro Willems back to SJP.
The 26 year-old returned to his parent club Eintracht Frankfurt in January with a knee injury and hasn't played since, although reportedly close to a comeback.
As it stands, Willems will be a free agent next summer and his chances of regaining a squad place for the second half of the Bundesliga season look to be fading.