Seth Smith was reinstated from the disabled list Tuesday and started the club's contest against the Twins at designated hitter, while lefty reliever Jordan Norberto was placed on the 15-day DL with left shoulder tendinitis.
It's the second time this year Norberto has been affected by the issue, having already missed time May 31 to June 20. Since then, he's posted a 1.69 ERA in 18 appearances with the A's, contributing to a 2.77 season mark spanning 39 outings.
Despite the loss of Norberto, the A's still have seven in their bullpen. He's eligible to return Sept. 2.
Smith, meanwhile, rejoins the team after making just one rehab start for Triple-A Sacramento, going 2-for-3 at DH on Monday night. He's batting .237 with 11 home runs and 39 RBIs for the A's this season.