The left-back joined Norwich in January on-loan to June after spending the first-half of the season with Sheffield Wednesday.
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However, Amass has returned to United and Carrington HQ for treatment to a hamstring injury.
The Sun says United management have hopes of Amass returning to Carrow Road before the end of the season, though the belief is that it is now unlikely.
The 19 year-old's contract with Amass runs to 2027.
