And of course keeping the depth charts updated on a weekly basis. I don't have a U21 player so I don't know if Sparky sends message to owners on a regular basis to push them / thank them, but I know Kumiko did and that's certainly something that keeps at least a few managers interested in the U21. Also I think I would avoid all the "19yo draftee is too old for U21" crap. I drafted 3 players at the age of 19, and I'm pretty sure they all would have been fine on the U21 at the time, and I still have them and still train them, and I know of at least another team (friend of mine) that is in the same position and thinks the same. In other words, no "hard" no to managers.