Hill (groin) threw a 10-pitch bullpen session Friday, Connor Letournau of the San Francisco Chronicle reports.
The A's are opting to play it cautious with Hill while he recovers from a groin injury. He last pitched May 29 before being placed on the 15-day DL. He sported a 2.13 ERA during the month of May. His next step will be to make a rehab start. The timetable for that is currently unknown.