Main Page | See live article | Alphabetical index The expanded roster in Major League Baseball refers to teams being able to increase the number of available players for each game from 25 players to 40 players on September 1. Although few teams regularly fill this extra roster room to its capacity, teams usually add a few select September call-ups -- minor league players added to the Major League roster after August 31st. The extra roster room gives teams -- particularly teams not in contention -- the opportunity to judge player development while giving them a taste of Major League competition. In this respect, the expanded roster is considered by some to be an early spring training. It has been criticized, however, for giving teams in contention too much roster flexibility during the pennant stretch. Nonetheless, September call-ups are not allowed to participate in the post-season as post-season rosters must draw from the pre-September 1st roster. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.