Right-hander Luke Hochevar, who took the loss for the Royals on Saturday against the Cardinals, was optioned to Triple-A Omaha as the club made a total of six roster moves following the game.
Shortstop Mike Aviles and reliever Robinson Tejeda were placed on the 15-day disabled list.
The Royals added pitchers John Bale and Roman Colon and infielder Tug Hulett, all recalled from Omaha. Bale had been on an injury rehabilitation assignment.
Aviles has a strained right forearm and Tejeda has tendinitis of the right rotator cuff.