Kelly (oblique) will begin a rehab assignment with High-A Greenville on Thursday, Chris Cotillo of MassLive.com reports.

EDGE Analysis

Kelly tweaked his right oblique during a relief appearance against the Blue Jays in late June, which prompted his placement on the 15-day injured list. The veteran right-hander has recovered enough to embark on a rehab assignment, and he'll need multiple appearances before returning to the Red Sox's bullpen. Kelly posted a 5.56 ERA, 1.46 WHIP and 25:9 K:BB across 22.2 innings prior to his injury.