The left-back has shone during his loan at the Championship crisis club so far this term.
Advertisement
Advertisement
And while the agreement runs for the entire season, United and Wednesday must settle on whether Amass will remain at Hillsborough after January, thanks to a clause in the deal.
The Manchester Evening News says Wednesday must formally make a request to United to extend the loan for another six months to extend Amass' stay.
However, United will still have final say and can bring him back to Old Trafford over the New Year.