Expanded roster
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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 rarely 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 31.
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 players on the August 31 roster or on the disabled list at that time.
