Rockies left-handed pitcher Brett Anderson will undergo surgery to repair a disk in his lower back Thursday in Phoenix, head athletic trainer Keith Dugger said Monday.

Anderson left an Aug. 5 start against the Cubs after three innings with back pain, and the issue did not improve with rest and treatment. Dr. Chris Yeung, a noted spinal surgeon in Arizona, will perform the operation. Unless there are other problems in the back, recovery time is five months, so Anderson should be ready for Spring Training.

The operation is similar to the one Rockies reliever Matt Belisle underwent as a Minor Leaguer in 2001 while a prospect with the Braves. Belisle had his surgery in late March that year and missed the season, but recovered in time to pitch in fall instructional ball and the Arizona Fall League.