KANSAS CITY, Mo. -- The Kansas City Royals purchased the contracts of right-handed relievers Joba Chamberlain and Louis Coleman from Triple-A Omaha on Monday.

Chamberlain, who is 25-21 with seven saves in 359 big league appearances with the New York Yankees and Detroit Tigers, was 1-0 with a 6.43 ERA with the Storm Chasers but allowed one earned run and seven hits in seven innings over his final seven appearances.

Chamberlain is a former Nebraska teammate of Royals All-Star outfielder Alex Gordon.

Coleman, the Royals' 2009 fifth-round pick out of LSU, went 8-2 with nine saves and a 1.68 ERA with Omaha. He is 5-4 with a 3.25 ERA and two saves in 148 relief appearances with Kansas City.

The Royals designated for assignment right-hander Yohan Pino and infielder Dusty Coleman to make roster space for Chamberlain and Coleman.