Boyle (back) is set to begin a rehab assignment at Triple-A Las Vegas in coming days, the Associated Press reports.
Boyle completed a "two-up" bullpen session Sunday that apparently went well, given the news of a rehab assignment serving as his next step. The right-hander was placed on the injured list May 6 after being lifted from a start against the Marlins a day earlier due to a back strain, and he may need only one or two rehab starts before being deemed ready for activation.