"We'll see how he feels tomorrow," A's manager Bob Melvin said, "but it was sore enough for him today to where we didn't feel it was a good idea to play him."
Valencia's absence led Melvin to play Josh Phegley behind the plate despite a right-hander starting for Tampa Bay. Stephen Vogt, originally slated to catch, started at designated hitter in place of Valencia, who has gone 5-for-32 over his last seven games after hitting .391 in his first six with the A's.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.