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.