The Royals have 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 Yankees and 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.