Like the Sunderland duo Ballard and O'Nien, Krystian Bielik will miss Birmingham's trip to Sunderland this weekend after picking up his fifth caution of the season in the draw with Ipswich Town.

Source: https://www.chroniclelive.co.uk/sport/football/football-news/birmingham-city-krystian-bielik-sunderland-28058445

Poland international Bielik, 25, was brought on in the 73rd minute but was booked for a foul on Dane Scarlett nine minutes later.

Source: https://www.shieldsgazette.com/sport/football/sunderland-afc/latest-sunderland-afc-news/three-players-to-miss-sunderland-vs-birmingham-city-due-to-disciplinary-rule-after-swansea-and-ipswich-draws-4398443

There are few better defensive midfielders at this level, if any, than Bielik.

Source: https://www.birminghammail.co.uk/sport/football/football-news/birmingham-city-player-ratings-middlesbrough-27957528