Cortes is out of the lineup for Sunday's game against the Red Sox.
The left-handed-hitting Cortes finds himself on the bench for a fifth consecutive game, with the Athletics having faced left-handed starters in the last four of those contests. Southpaw Erik Miller is expected to work only an inning or two in a bullpen game for the Red Sox on Sunday, so Cortes could be summoned from the bench if a righty reliever takes over for Boston.