17 players are required according Football Sequence 49.381
(you need to elaborate on this question: What football players, and use for what?)
There should be 22 players on the field 11 players from each side are allowed.
they don't need any
As there is so many players something can happen in a second
There is just about always a need for pro football players. just like there's a need for professional players of any sport. Football players in EPL in England have been pro for decades, while Rugby is only last 10 years.
the armband has all of the plays that the players need to know on it.
Yes, they do need math. Perhaps for their paycheck.
you need a bunch of stuff .
No, but most players do.
Football players should be well rounded in all the core subjects such as Math, English, and Science.
so they can grip the ground with their turf shoes just like some soccer players do sometimes