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MLB teams prepare for September roster expansions

2 sources • 1 min read • Latest: Aug 31, 2026, 1:42 AM

Last updated Aug 31, 2026

MLB teams prepare for September roster expansions
Summary

Major League Baseball teams gain flexibility with roster expansion beginning Tuesday. While clubs no longer add 40 players, additional roster spots create opportunities for prospects to receive promotions from the minor leagues. Walker Jenkins represents a primary target for fantasy rosters following his recent call-up. Other prospects such as Seaver King, Franklin Arias, and Ralphy Velazquez remain under consideration for potential major league appearances during the final month of the season. Teams may evaluate younger talent as they conclude the regular season, though specific promotion decisions depend on organizational needs and internal roster status. Players like Jonah Tong and Ryan Sloan also remain candidates for call-ups to address rotation depth.

Source Links
CBS Sports
Key Details
  • •MLB rosters expand on Tuesday to allow for additional player call-ups.
  • •Ralphy Velazquez hit 15 home runs in August while striking out only 16 times.
  • •The Nationals may look at Seaver King following their shift of C.J. Abrams to second base.
  • •San Diego remains a candidate to promote Ethan Salas despite their current catching depth.
  • •Jonah Tong posted a 2.00 ERA over his previous seven starts.
Latest Updates
  • 1:42 AMCBS Sports — Week 24 Fantasy Baseball Waiver Wire: Lazaro Montes leads September call-up candidates
  • 11:23 PMCBS Sports — Week 24 Fantasy Baseball Waiver Wire: Are there any impact prospects left?
What they're saying
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September roster expansion opens the door for high-impact minor-league talents like Ralphy Velazquez and Seaver King to make a fantasy difference down the stretch.

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September roster expansion opens the door for high-impact minor-league talents like Ralphy Velazquez and Seaver King to make a fantasy difference down the stretch.

Related Teams & Leagues
Baseball

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