From SAFC.com which I think is a summary of their manager's press conference.
Dan Ballard has been ruled out for Sunderland’s New Year’s Day fixture with Manchester City.
The defender missed Sunday’s 1-1 draw with Leeds United through injury and won’t be involved again as he continues his recovery.
Head Coach Régis Le Bris offered reassurance that he is progressing well. He said: "He is getting better but he won’t be available for tomorrow.
"We hope he is available for the next fixture but it is not serious."
Sunderland will be boosted by the return of Luke O’Nien, who is available for selection after serving a three-match suspension.
Habib Diarra, Chemsdine Talbi, Noah Sadiki and Arthur Masuaku have all prolonged their stays with their respective countries at the 2025 African Cup of Nations by reaching the knockout phase of the competition. Bertrand Traoré and Reinildo will be hoping to join them this evening when they play their final group games.
Le Bris added: "They are all good players in good national squads. We wish them the best. It will create positive vibes later when they come back."
Aji Alese remains absent from selection as he continues to recover from long-term injury.