Quit / close down the game. Reload a save from the previous day.     At least in FMM23 - you often can retrain a player in a position where he has (a) zero familiarity, and (b) at least ‘very poor’ aptitude to learn that position … though it may take a full season to learn. However it seems to slow their development during this period, so with lower PA players (like in lower leagues), I usually try to fully develop their attributes first, then retrain their positions later. Th
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