Edwards (back) will join Triple-A Iowa on Monday for a rehab assignment, Mark Gonzales of the Chicago Tribune reports.
Edwards threw bullpen sessions Wednesday and Saturday to clear the way for his rehab stint. The right-hander moved to the injured list in mid-June with a left thoracic strain and appeared to find his groove on the mound prior to the injury with one unearned run allowed over his last 7.2 innings.