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ok so we are playing our first match tomorrow, is it ok for us to sub two players for the 2nd map ?

.6.8 Player changes during a match

You can theoretically switch all players after a map change (as long as they are entered correctly on your rosters’ page). A player change during a running map is only possible if a player has technical problems to play on.

So yes, after the map has ended you can swap as many players as you see fit, providing they are registered under your team on this site and have entered the correct details (STEAMID etc)