Bergman (oblique) will begin a rehab assignment with Triple-A Albuquerque on Wednesday, MLB.com's Thomas Harding reports.
He completed a 45-pitch simulated game on Saturday, and the Rockies plan to let him throw 60-65 pitches in Wednesday's simulated game. Bereman's role at the big league level is that of a long reliever who can start from time to time, so the team wants him comfortable logging five innings before they activate him from the DL.