Having a narcissist — someone who is grandiose, self-promoting, and larger than life — on your team can be a challenge. While their drive can be effective in moving organizations forward, their insistence on winning at all costs can create havoc on a team. You can mitigate the effects of their behavior by creating a strong sense of team cohesion and encouraging everyone to openly and constructively confront problematic behavior. A group setting makes dysfunctional acting out more noticeable, controllable, and discussable — and appropriate peer pressure will push the narcissist to adapt to the group’s norms. Plus, feedback from many people is harder to ignore than feedback from one person.
Source: HBR