After Monday's 8-5 loss to the Indians, Adcock was optioned to the Storm Chasers for the third time this month. Right-hander Vin Mazzaro was recalled for the second time to take his Royals roster spot.
"Back to Omaha, it's a carousel," Adcock said. "They need an arm and the bullpen is important, they've got to save the bullpen. You can't wear these guys out and I didn't do my job, so that's why we're going."
Manager Ned Yost said that Mazzaro will act as a long reliever. Mazzaro was 1-0 with a 4.50 ERA in two games for the Royals this year. For Omaha, he's 2-0 with a 4.40 ERA in eight starts, the last one on Friday.