September has traditionally been a time for MLB teams to expand rosters and call some prospects up once the minor league seasons have concluded to give them a taste of big league action. Expanded rosters have been around since 1910, when formal roster limits were imposed, but the rules allowed teams to increase their rosters in September. For several decades, that means teams could have up to 40 players on a roster. But some argued that expanded rosters caused teams to change strategies during the most important part of the schedule. In 2020 MLB reduced expanded rosters in September to just 28.
Still, the month provides an opportunity for prospects
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