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.
Manager broke a promise
Serious
Cause
Even an honest tone was resented given the strained relationship.
Hard conversation with the manager about playing time
Moderate
Cause
The discussion focused on playing time.
Asked the manager for a private conversation
Minor
Cause
He has concerns about his role and standing in the squad. His relationship with the manager is steady but tense. He has already raised this with the manager recently.