Stripling fired a scoreless sixth inning in an extra-inning loss to the Mariners on Saturday, issuing a walk.

The Athletics reinstated Stripling (back) from the 15-day injured list Friday.

Stripling (back) completed a live batting practice session Tuesday, MLB.com reports.

Stripling (back) emerged from Saturday's bullpen session healthy and is slated to face live hitters Tuesday, MLB.com reports.

Stripling (back) came out of his bullpen session Wednesday feeling good and will thrown another one Saturday, MLB.com reports.

Stripling (back) is scheduled to throw a bullpen session Wednesday and another several days after, MLB.com reports.

The Athletics placed Stripling on the 15-day injured list Wednesday, retroactive to Sept. 9, with a lower-back strain.

Stripling fired 4.1 scoreless relief innings in a loss to the Brewers on Friday, allowing two hits and two walks while recording four strikeouts. He did not factor into the decision.

Athletics manager Mark Kotsay said Tuesday that Stripling is being shifted to a long-relief role, Mark Bowman of MLB.com reports.

Stripling (2-11) allowed four runs on five hits and a walk while striking out two in 5.1 innings during Tuesday's loss to the White Sox.