Hull City manager Steve Bruce has demanded an apology from out-of-favour defender Paul McShane.
The Republic of Ireland international, who's the club's longest serving player and a firm favourite with the fans, hasn't played since the start of November, and has recently taken to social media to vent his frustration after being sent to train with the club's development squad.
At today's news conference ahead of the Boxing Day fixture at Sunderland Bruce wouldn't elaborate on the exact reasons for their bust-up, but he said the ball is in McShane's court.
Hull defender Paul McShane expects to be out for six months with the ankle injury sustained against Southampton on Tuesday.
McShane was taken from the field on a stretcher following a collision with goalkeeper Steve Harper at the KC Stadium and was immediately sent to hospital.
The club have requested follow-up scans to determine the extent of the damage, but they will not be possible until early next week when the swelling has subsided.
Republic of Ireland international McShane is convinced he faces a lengthy spell on the sidelines, though.
He told the Irish Daily Star: "I am out for six months with an ankle ligament injury and micro fracture of the bone.
"I am going for an operation next Monday and I have to get myself right as quickly as I can.
"It's very frustrating to be honest as I was feeling very good. Now I must battle back as quickly as I can."
The news ends a frustrating first season back in the top flight for McShane, who has also suffered hamstring trouble this season and has featured just nine times in the Premier League.