The Athletics placed Jimenez on the 15-day injured list Sunday due to a strained left oblique.
In his most recent relief outing Wednesday against the Royals, Jimenez recorded a hold while throwing one scoreless inning, but he may have injured his oblique at some point. He's been one of Oakland's best options out of the bullpen since being recalled from Triple-A Las Vegas on May 31, posting a 2.00 ERA and 1.33 WHIP over nine innings. With Jimenez headed to the IL, the Athletics selected Aaron Brooks' contract from Las Vegas in a corresponding move.