The Athletics have designated righty Brian Schlitter for assignment, per a club announcement. His roster spot goes to the just-acquired Jake Diekman.

Additionally, the Oakland org announced that right-hander Jharel Cotton has been activated from the 60-day injured list. He was optioned down to Triple-A.

Schlitter, 33, has seen sporadic MLB action since his 2010 debut, appearing in parts of four seasons. This year, with Oakland, he allowed four runs on a dozen hits with six walks and four strikeouts in 9 2/3 innings of work. Schlitter has spent most of the season at Triple-A, where he carries a 3.89 ERA in 34 2/3 frames with 7.0 K/9 and 1.3 BB/9.