Walton is out of the lineup for Sunday's game against the Twins.
Walton will hit the bench while southpaw Connor Prielipp toes the rubber for the Twins, but the left-handed hitter should play regularly versus right-handed pitching until Zack Gelof (knee) or Joshua Kuroda-Grauer (testicle) return from the injured list. Since joining the Athletics on July 12, Walton has gone 2-for-16 with a 7:5 BB:K and five runs in eight games.