Major League Baseball took all the fun out of what was once an important trade deadline on August 31, by moving it back to the end of July. But the rules remain the same for September call ups — when teams can call up to 40 players to their major league roster and give a look to some prospects who may be part of the team’s future.
Enjoy this while it lasts, though, because in 2020, the new rules limit the number of players on the roster in September to 28. That might result, if anything, in a few more veteran players being let go a month before the end of the season so that non contenders can have a look at some of their younger players.