Jackson (elbow) is beginning a rehab assignment with Single-A San Jose on Sunday, Alex Pavlovic of NBC Sports Bay Area reports.

EDGE Analysis

Jackson is first eligible to come off the 60-day injured list May 29, and the right-hander may be ready to go by that point if he endures no setbacks during his rehab assignment. He's working his way back from the Tommy John surgery he underwent last February and will presumably require several outings in the minors to build up his velocity and hone his command. Once activated, Jackson could emerge as a late-inning option out of the San Francisco bullpen.