September roster moves are already reshaping the Red Sox, and Tuesday brought a notable mix of reinforcements and roster turnover.
Boston activated Isiah Kiner-Falefa off the Injured List and brought him back to the club as the calendar turned to the final month of the 2026 regular season, when teams can carry 28 players on the active roster instead of 26. The Red Sox also selected 22-year-old right-hander Jedixson Páez to the Major League roster from Triple-A Worcester, and he is set to make his Boston debut Tuesday night against the Seattle Mariners.
To clear space, the Red Sox placed Eduardo Rivera on the 60-day Injured List and designated Brett Harris for assignment.
"Selected right-handed pitcher Jedixson Páez to the Major League roster from Triple-A Worcester," the Red Sox announced. "He will start tonight's game against the Seattle Mariners.
Reinstated infielder Isiah Kiner-Falefa from the 60-day Injured List. Recalled left-handed pitcher Eduardo Rivera from Triple-A Worcester and placed him on the 60-day Injured List with a lumbar strain.
Designated infielder Brett Harris for assignment."
Kiner-Falefa returns as the kind of steady veteran clubs lean on when the season tightens up. He was with the Toronto Blue Jays last year during their World Series run, and before his IL stint he was batting .277. Beyond the numbers, he gives Boston experience and flexibility on a roster that has plenty of youth.
Páez’s path to the mound has already taken a few turns. The White Sox selected him in the Rule 5 Draft, and he made his big league debut earlier this season with Chicago before being returned to Boston. He has made three starts for Triple-A Worcester this year and posted a 2.92 ERA, which earned him this latest shot in the majors.
Rivera’s year ends with a mix of promise and production. He debuted in the big leagues and appeared in four games for Boston, including three starts. Most of his season came with Worcester, where he put up a 2.96 ERA in 24 appearances.
Harris, meanwhile, is the odd man out. The three-year MLB veteran appeared in one game for the Red Sox earlier this season, and his 2026 campaign has been split between Boston’s organization and the Athletics’ organization. With the DFA, he now goes on the waiver wire as other clubs get a chance to claim him.
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