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.
Struggling to settle into the squad
Minor
Cause
The settling-in period at a new club is the bigger picture. The language gap is making integration harder.
Outlook
Manager intervention may be required if it persists.
Wants to head back home
Serious
Cause
After a long, difficult settling period he is openly hoping for a move home or to a familiar club. (The move took him to a different continent.; He still does not speak the local language.)