Yep, but that is 13 more TSP, so another 1.3 season of training xD
Seriously now, should a coach with a promising player end up with the piece of crap Joe just linked above I'd blacklist him. You just can't target U21 and NT at the same time, unless the organisation is flawless. And regardless of the player's potential, even if the guy was 7 or 8 potential, this result is just plain garbage. I would never advice a coach to train a player this way, even it's beneficial to our U21 : you could end up with a valuable U21 player for a season, and lose the confidence of a coach for the rest of his BB career, not worth it.