Switching players once a tournament starts

[Temidayo_]

If by players, you mean Association Managers, no, you can't remove or add managers after association starts.

If you mean individual players in a particular team, yes, you can. Doesn't work any different than other tournaments.

[Dino Zagreb]

So, does tournament start after friday drawing or at saturday first match?

[Temidayo_]

So, does tournament start after friday drawing or at saturday first match?

Tournament starts when the draw is made, on Friday.