Jimenez (shoulder) will begin a rehab assignment at Triple-A Las Vegas on Friday, Martin Gallegos of MLB.com reports.
Jimenez has progressed smoothly in his recovery from a shoulder strain over the last several weeks. He's thrown several bullpen sessions and faced live hitters Tuesday. The right-hander isn't expected to require a lengthy rehab assignment, so he'll likely be able to rejoin the Athletics' bullpen sometime next week.