McNair perhaps put in his best performance of the season in Sunderland's most recent game.
Sunderland's Paddy McNair celebrates with Lee Cattermole
Sunderland fans have taken to Twitter after David Moyes confirmed to the club's official website that Paddy McNair is set to miss the rest of the season after he ruptured his anterior cruciate ligament.
Though, like the rest of the Sunderland side, McNair had struggled during the first few months of the campaign, his performance against the Tigers highlighted how cruel a blow the 21-year-old's injury is.
The Northern Irishman arguably put in his best display of the season in the Premier League against Hull - though his display in the EFL Cup tie with QPR in September was perhaps even better - so may well be a big miss for the side as they try to capitalise on their momentum.
Sunderland manager David Moyes
After a terrible start, Moyes' team have won their last two and are now just three points adrift of safety. But, of course, they will have to continue their recovery without McNair.
Sunderland fans have taken to social media to discuss the news. And while some do not appear to feel that his absence will hurt the team too much, others have praised McNair's attitude after he continued to play on for 46 minutes after sustaining the injury (via The Guardian).
Sunderland's Paddy McNair in action with Southampton's Jack Stephens
Gutted McNair is out for the rest of the season. Played well the last couple of games. #safc— jack waldron (@waldron1994) 23 November 2016
So with that McNair injury Sunderland are left with O'Shea, Denayer and Kirchhoff to pick from during the African Cup, Yikes.... #SAFC— Crichton (@MattyCrichton) 23 November 2016
Feel sorry for Paddy McNair, I felt he was turning a corner and starting to settle down. Another midfield gap to fill in Jan. #safc— Jonny McFadden (@jonnymcfadden) 23 November 2016
Paddy McNair done his ACL. That's him out the season. Luckily got Larsson and Kirchoff coming back. Medical team been non-stop. #safc— Paul Doran (@PabloTheMackem) 23 November 2016
Paddy McNair was starting to look the part in the middle, just as he's getting there an injury. Frustrating! #SAFC— Kristian Whatcott (@Kridoin) 23 November 2016
Good effort by McNair to play on for 40 minutes with no knee. How it wasn't detected mind Hopefully the lad recovers well #SAFC— Wise Men Say Podcast (@WiseMenSayPod) 23 November 2016
all the best to McNair and hoping for a speedy recovery #safc— Hannah Brown (@brownh1989) 23 November 2016