So I don't understand the reason for it. We can't play our players in matches if they're on it, so I find myself transferring players from youth team to regular squad once a week for friendlies, then put them back on the youth team....but why should I do it? Are there training bonuses or salary effects, or does it speed the time to adapt to a new team? If so, do these get applied if they move from youth to main squad (and back) once a week for a day or so? Thanks in advance!