September call-ups will be in full force in a few days, so it's important for fantasy owners to know if their players will be impacted. The teams fighting for a playoff berth won't rely heavily on players who spent the entire year in the minors, but the teams that are looking toward next year definitely will. The good news is if there was a young stud playing well in the minors, more than likely, he is already up in the big leagues.
However, there is always a chance an organization has been waiting until September to bring up a player and allow him to showcase his talent at the expense of a veteran. The key is following the news and understanding the players who could be affected.