United are hopeful that Herrera will agree terms, and the Spain midfielder is understood to be very keen to stay at Old Trafford.
United triggered a 12-month option on Marouane Fellaini's contract a year ago to ward off interest from China. Talks are underway over a new deal but the Belgium midfielder's representatives are understood to have rejected an opening offer. Nemanja Matic and Ander Herrera are expected to continue to feature in Pogba's place.
Pogba has already missed seven games since picking up the injury, although United top their Champions League group with three wins from three matches and lie second in the Premier League despite his absence.
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'We have been solid, not only in the Champions League, but during the whole season, ' said Herrera. It's another clean sheet and we conceded nearly no chances which is not easy when you come to Portugal.
Fellaini's situation, however, remains firmly in the balance, but you sense Mourinho will not allow the club to reach a deadlock in negotiations with a player he deems too important to lose.
He will not play against Huddersfield on Saturday. "I expect Eric Bailly to be back next week but I can not tell you about (Marouane) Fellaini or Pogba because I have no idea".