The Twins transferred Stewart from the 15-day injured list to the 60-day IL on Friday, Do-Hyoung Park of MLB.com reports.
Stewart will undergo arthroscopic surgery on his right shoulder Tuesday and is expected to be sidelined for 5-to-6 months. He's been limited to just 16 appearances this season because of nagging shoulder problems. If there's a silver lining, it's that Stewart is undergoing a cleanup procedure and is expected to be healthy in time for spring training. That said, Stewart will turn 33 years old in October and has missed considerable time over the last several years with arm issues, so it's not a given that he'll be as effective upon his return. He holds a 2.28 ERA and 59:19 K:BB over 43.1 frames for the Twins since the beginning of the 2023 season.