Their personalities have rubbed against each other for a while now. It played out behind the dressing-room door, away from the cameras.
Outlook
Repeated incidents may damage dressing-room status.
Fighting to save the manager's job
He has made a formal demand: Permission to leave if the offer is right
Mind
Asked the manager for a private conversation
Moderate
Cause
He cannot continue in his current tactical role. His relationship with the manager is steady but tense. He has already raised this with the manager recently.