Eric O'Flaherty (elbow) threw an 18-pitch bullpen session Tuesday.
Coco Crisp doubled twice in four at-bats as the Athletics fell to the Padres 6-5 on Tuesday.
Phil Humber was hit around on Tuesday against the Athletics, surrendering four runs while recording only one out.
Jed Lowrie went 2-for-4 with a home run on Tuesday against the Padres.
Sonny Gray tossed four shutout innings in Tuesday's start against the Padres.
Derek Norris (back) could return to the lineup on Wednesday, according to A's manager Bob Melvin.
Addison Russell (hamstring) will miss at least one week.
Craig Gentry (back) hit off a tee Monday, but Oakland still doesn't have a timetable for his return to game action.
Addison Russell left Monday's game versus the Dodgers with a strained right hamstring.
Luke Gregerson allowed four runs in a third of an inning during Monday's 8-8 tie with the Dodgers.
Michael Taylor went 1-for-3 with a home run against the Dodgers on Monday.
Josh Donaldson went 2-for-3 with a home run and two RBI against the Dodgers on Monday.
Jarrod Parker struggled in Monday's start, allowing four runs in 4 2/3 innings against the Dodgers.
Craig Gentry (back) is expected to do some workouts Monday.
Athletics manager Bob Melvin said Monday that Daric Barton (hamstring) will miss at least a few more days.