Burnes (elbow) began a throwing program July 10 and felt good following the session, MLB.com reports.
Burnes had been working his way back from Tommy John surgery during April and May but was forced to shut down in early June. The plan calls for him to throw off flat ground every other day and then progress to throwing off a mound. The Diamondbacks hope the right-hander can return in time for a September playoff push.