Maguire was forced off in Sunday’s FA Cup fifth round penalty shootout defeat to Fulham, being withdrawn ahead of the start of extra-time. He was replaced by youngster Ayden Heaven, who was awarded his debut after arriving from Arsenal last month.
United are already without fellow centre-back Lisandro Martinez, who suffered an ACL injury at the beginning of last month, meaning Maguire’s absence is another blow for Amorim.
On the flip side, Toby Collyer is contention to return from a muscle injury against Sociedad after being included in the travelling squad. He trained with the main group at Carrington earlier today after missing the last four matches.
Patrick Dorgu is also back in the squad after missing the defeat to Fulham through suspension. He was sent off against Ipswich Town last week, earning a three-match ban, but that suspension only applies to domestic fixtures. Harry Amass has also been named in the 18-man squad.