I currently play a lot of youth players in the first team in a lower league but a lot of them go away when we have games. Is there any way to stop them from going on international duties, can't find the option to keep them at home anywhere.
You can only withdraw players from playing international friendlies,as far as I know.
The only way to stop players from playing competitive internationals is to get them to retire from international football,which is highly unlikely.