We currently have;
3 Full England Internationals 23/24 years old: Pickford/Keane/Barkley
6 U21 England Internationals: Kenny/Holgate/Davies/Dowell/Lookman/DCL
2 High potential Full Internationals: Vlasic/Onyekuru
David Unsworth won the u23s league last year and strengthened with a few signings including Lewis Gibson and Dennis Adeniran (England u17 /18s) and we also have others such as Connolly and Walsh on loan and unknowns such as Nathangelo Markelo (Holland u19s).
This club really has some top young players....that I don't trust Ronald Koeman with.
Problem is we're an established PL side now and no manager in the world is likely to play a lot of those at once; there's too much financial risk if it goes wrong. We could say "Unsworth will play them all" but there's no way he'd come in and bench a load of senior players with the big wages, would cause too much upset.
I don't really know what the answer is anymore to our troubles.