The World Cup hasn't even begun and already there's been a training ground run-in between two Dutch players and Cameroon's entire team delayed its flight to Brazil in a dispute over their tournament bonus.

Prodigious talent often goes hand-in-hand with oversized egos and managing them can be a full time job for team leaders in the pressure-cooker environment of the sport's showcase event.

Sometimes, players' feelings need as much massaging as their calf muscles.

"Conflict is inevitable," sports psychologist Bradley Busch of London-based mental skills training company Inner Drive said Monday. "It is what the team then does with it that is important."