Manager Bob Melvin said before Sunday's game that he is not yet sure what the plan will be for Reddick going forward.
With Reddick and Brandon Moss (strained right calf) out of the lineup, the A's recalled catcher Stephen Vogt from Triple-A Sacramento while demoting right-hander Fernando Rodriguez.
Reddick, a key piece for Oakland defensively, is batting just .214 with four home runs and 22 RBIs. He was mired in a 4-for-35 slump before leaving the game Saturday.
Aaron Leibowitz is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.