Pittsburgh Pirates face roster decisions amid Mitch Keller injury

The Pittsburgh Pirates are facing questions regarding the future role of pitcher Mitch Keller following a decline in performance and a major muscle injury in his throwing shoulder. After serving as a reliable starter from 2022 through 2025, Keller struggled significantly after his eighth start of the 2026 season, posting a 6.95 ERA in subsequent outings.

As MLB rosters expand for September, the Pirates have the opportunity to add two players to their 28-man roster. Pitcher Khristian Curtis is identified as a top candidate for the pitching spot. The 24-year-old has shown promise in his limited MLB appearances, including eight combined scoreless innings this season.