His relationship with the manager has soured. His relationship with the manager is steady but tense. He has already raised this with the manager recently.
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.)