Are you referring to your 18 y.o., 3.5k salary Armenian guy, who is better than the 17th best player in the Armenian U21 team? Just train him, and when he's good enough to contribute you may have a case. Until then, the coach may want to encourage national users to train their kids, or have any other reason not to pick your guy. And he doesn't owe you any explanation, I would think. Besides, he loses enthusiasm if he adds/drops someone, so why do that for a guy that's not even going to play?