Colon appeared in five games for the Royals this season, giving up four runs in two innings. He was designated for assignment on April 16 and outrighted to Triple-A Omaha five days later.
For his five-year Major League career -- spent with the Braves, Tigers and Royals -- the 30-year-old Colon is 8-10 with a 5.12 ERA in 121 games (eight starts).
Alden Gonzalez is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.