1) You can't promote. They auto promote when they hit 20. They can still play in Senior games though.
2) Setting training does not reduce training efficiency. Having more players than the soft-limit of the squads (20 players for senior, 25 for youth) will cause training efficiency to fall. That is, if you have 21 players in your Senior Squad, your training efficiency drops. 22 players, it drops further. And so on.
2) Setting training does not reduce training efficiency. Having more players than the soft-limit of the squads (20 players for senior, 25 for youth) will cause training efficiency to fall. That is, if you have 21 players in your Senior Squad, your training efficiency drops. 22 players, it drops further. And so on.