Walton went 3-for-3 with a home run, four RBI and a stolen base in Saturdays' 12-6 loss to the Guardians.
Gelof went 1-for-4 with a three-run home run during the Athletics' 5-3 loss to the Guardians on Friday.
Barnett did not factor into Friday's decision against Cleveland, allowing three runs on seven hits and four walks while striking out four across 3.1 innings.
Cleavinger (forearm) is expected to resume mound work Saturday, MLB.com reports.
Seymour (9-7) was tagged with the loss against the Red Sox on Friday, allowing four runs on seven hits and two walks while striking out five across five innings.
The Athletics optioned Rock to Triple-A Las Vegas on Friday.
The Athletics recalled Barnett from Triple-A Las Vegas on Friday.
Clarke went 1-for-2 with two steals and a walk in Thursday's 10-1 loss to the Rays.
Butler went 2-for-4 with a solo home run in Thursday's 10-1 loss to the Rays.
The Athletics will recall Barnett from Triple-A Las Vegas to start Friday's game against the Guardians, Martin Gallegos of MLB.com reports.
The Rays are the best team in the AL and have a 50-25 record at home. The A's are awful. Griffin Jax on the mound for the Rays has mostly been good with a few clunkers mixed in, but the A's lineup -- especially on the road -- these days isn't scary. A's starter Jack Perkins has a 6.53 ERA. This won't be close.
