In four games (three starts) for the Storm Chasers, Brooks was 0-1 with a 4.80 ERA.
"He's been starting so he's stretched out fine, and he's going to be here in case we need length," manager Ned Yost said.
Brooks, 24, from Cal State-San Bernardino, split last season between Class A Advanced Wilmington and Double-A Northwest Arkansas, and was a combined 9-10 with a 4.28 ERA in 26 starts. In 160 innings, he had 110 strikeouts against just 22 walks.
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.