Lamb (back) underwent surgery to repair a lumbar disc herniation Tuesday, Mark Sheldon of MLB.com reports.

EDGE Analysis

Lamb has experienced his fair share of injury issues over his career, but this surgery will keep him out for a good amount of time. Its unclear what kind of timetable the left-hander is facing, but he is not expected to be ready for Opening Day. His return date should become closer as he progresses through his rehab process.