Well time ago I said something about this,, like in the real football, some teams put 1 star on the jersey, when they win they'r 3rd, 5th, 10th or 20th league;

So my suggestion is;

3 leagues = 1 star
5 leagues = 2 stars
10 leagues = 3 stars
and for 10 leagues +, 1 star + in the jersey, under the emblem.

This game is about stars, nope?

(^-^)