Bailey Wright has been ruled out for eight to 12 weeks after suffering an ankle injury in Sunderland’s victory at Oxford United.
The defender, who moved to the Stadium of Light on loan in January, was forced off with 84 minutes played at the Kassam Stadium.
Wright, 27, has made five appearances since arriving on loan, during which time the Lads kept four clean sheets.
Speaking to safc.com, Phil Parkinson revealed his disappointment upon hearing the news.
“It didn’t look good at the time and further tests have unfortunately confirmed that he will miss eight to 12 weeks,” said the Sunderland boss.
“It’s a blow for the squad, but more than anything we are disappointed for Bailey because he’s come into the team and played really well."
He added: “I’m sure he will come back stronger, but as I have mentioned many times before, the lads currently out of the team have been excellent and we have good options available in his absence.”