This is not managers fault , when season changed players are grown up , its not the job of managers to check this , this is developers job
Are you mocking at us? What is an U21 manager for, then?
If a U21 manager confirms a list with forbidden players, 2 things can happen:
1 - He only cares winning, no matter the cost.
2 - As U21 manager, he sucks. Because he doesn't do any planning at all.
Now, considering that Albania U21 played friendlies with many forbidden players and hard tackling last season. I think Albania U21 manager is one the first group.
And to add, this is similar than the multiple marches bug, blaming the system is a cheap excuse... "oportunity makes the thieve" we say....