Looking at the Game Manual, about National Temas I read this:
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..and play a round robin from Week 2 to Week 8
However, when I look the U21 Qualify Schedule, the first game will be the next monday when the election process will finish.
That means that the new U21 Manager probably couldn't make a roster as he wish because
Dismissing a player from a National Team causes a drop in the national team's enthusiasm; the more frequent the dismissals, the greater effect they have on enthusiasm. Adding players does not impact enthusiasm.
So, If we take on account the next:
At the start of continental competitions and the consolation tournament, the enthusiasm reset will take place between 18:00 server time on the Saturday before the start of the competition and the tipoff of the first game
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Sorry if I'm confused 'cause I never have managed an NT, but if the reset will happen the saturday, if the new U21 NT Coach dismiss some players and call others, the enthusiasm will drop and he will have to face the first game in bad conditions.
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So, if the BB's bring forward the schedule for qualify, why didn't do the same with the election?