page_title: Major League Baseball rosters
section_title: September call-ups
hierarchical_section_title: Major League Baseball rosters / Expanded roster / September call-ups
caption_attribution_description: English: Professional baseball player Fred Lynn
context_page_description: A Major League Baseball roster is a roster of players allowed, by league agreement, to play for their respective Major League Baseball team. As of the 2019 MLB season, there were generally two types of rosters, the "active roster" of 25 players and the "expanded roster" of 40 players. The active roster size will expand to 26 players beginning in the 2020 season.
context_section_description: September call-ups are players who, historically, were added to MLB rosters late in the season.
caption: Fred Lynn made his MLB debut as a September call up in 1974; he would later be the American League's Rookie of the Year and MVP in 1975.
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