The only way I would see this happen is if there was a system similar to the NBA D-League, so we could send players with less than 3 years exp. or maybe under 21 yrs old to a farm team (user controlled or maybe a bot) where they could be developed.
why would i lend a player that wont train for a whole season? if you dont need him for the current season sell him and use the money to buy a similar at the beginning of the next one - there is plenty of supply...