Kluber threw 31 pitches in a bullpen session Friday, Jen McCaffrey of The Athletic reports.

EDGE Analysis

Kluber is coming off a fully healthy season, his first since 2018. In 31 starts for the Rays, the right-hander posted a 4.34 ERA and showed hints of an effective pitcher that previously earned a Cy Young Award. The 36-year-old is looking to build off last season and will slot in the middle of Boston's rotation.