Palmer has missed the last three games due to a nerve injury in his shoulder. He recently visited Peyton Manning's nerve specialist, after which the doctor believed he finally got the nerve in Palmer's shoulder to release.
Drew Stanton started in place of Palmer in all three games, but sustained a concussion last week against the Denver Broncos. He was replaced in the fourth quarter by third-string QB Logan Thomas, who took the majority of first-team snaps in practice last week. .
Palmer practiced with Arizona's first-team on Friday, and was scheduled to get his nerve re-checked later in the day. Head coach Bruce Arians said Friday he didn't know yet which quarterback would start against Washington. Later Friday, Stanton reportedly cleared concussion protocols.
In Palmer's one start this season, he completed 24 passes for 304 yards and two touchdowns.
The Cardinals are 3-1 heading into Sunday's game against Washington (1-4).
- Molly Geary