What about scrimmages/cup games? That's what I thought.
There is 1 scrimmage or cup game per week.
There are 2 league games per week.
That is 3 games.
The most players you can hope to give 48 minutes to in one position training in 3 games is 3.
(...and yeah, you can have a 4th game if you go to 3 games in the League Finals, but that is a rarity...)