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.
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