The 29-year-old left-hander has been hampered by left biceps tendinitis in his first season with the Royals. He is 1-2 with a 6.75 earned run average in six starts.
The Royals also recalled promising second baseman Johnny Giavotella from Triple-A Omaha. Giavotella batted .247 with two home runs and 21 runs batted in over 46 games in his first stint in the majors last season.
Ohio bar shooting arrested, charged with murder
Attkisson leaves CBS News, reportedly over network's 'liberal bias'