I explain myself, little example.

I play a match 5on5, but 1 of them got to wait (24hours after applying for team)
But if a team accepts that that player plays in a match and say in chat that the player is allowed to play, but are they allowed to refuse result after match ?

is this player yours or there?

They / You will have to agree to let him/her play

1. check there roster for green ticks and steam id's before the game, if they tell you in game one isnt greenticked it is up to to either not play (default or void) or play. soon as u say its ok and go live you wont be able to turn back, specially aswell if the result gets accepted