Team leader

The team leader is the player (not coach) with the highest leadership factor.

From the rules:

Leadership and agreeability are only applied to the player with the highest leadership factor, "the team leader". If this person is agreeable, the team atmosphere will be as well, and if he's nasty you might end up with a really nasty atmosphere in your squad. A coach with strong leadership abilities might counteract a disagreeable "team leader" amongst the players.