While juggling roster moves to make space for new trade additions and Rule 5–eligible prospects, the Boston Red Sox quietly picked up a young arm.
Boston signed 25-year-old Puerto Rican pitcher to a minor league deal, per Francys Romero. Berrios was originally drafted by the Oakland Athletics in 2017 and spent more than five years in their system before being acquired by the St. Louis Cardinals in June 2024. He also spent time with the Frontier League’s Gateway Grizzlies before joining St. Louis.
Former Red Sox chief baseball officer Chaim Bloom was in the Cardinals’ front office when Berrios was signed. Bloom has since become St. Louis’ president of baseball operations following John Mozeliak’s retirement. His talent-evaluation skills benefited Boston during his tenure, producing prospects such as Marcelo Mayer, Kristian Campbell, Kyle Teel, and Roman Anthony — and the Red Sox continue to benefit from players he identified.
Berrios has pitched across parts of seven minor league seasons and reached Triple-A for the first time in 2025. He finished last year with a 5.12 ERA across St. Louis’ Double-A and Triple-A affiliates.
His struggles came mainly in Triple-A Memphis, where he allowed 15 runs on 23 hits in 14.2 innings, striking out 14 and walking nine. His Double-A performance was much stronger — a 3.74 ERA with 48 strikeouts and 15 walks over 43.1 innings.
Last season, he averaged 9.62 strikeouts per nine innings and 3.72 walks per nine. Boston’s pitching development system has earned a reputation for helping pitchers sharpen their repertoires and focus on their best offerings, giving Berrios a real opportunity to improve.
He still needs more seasoning in the minors, but if he adapts well to Boston’s pitching program, he could make his MLB debut as soon as this season. With Boston parting ways with four veteran relievers on November 18, Berrios could eventually help fill some of those gaps on the big-league staff.