The Cubs placed Steele on the 15-day injured list Wednesday with left elbow tendinitis, Taylor McGregor of Marquee Sports Network reports.
Steele had to be scratched from his scheduled start Tuesday due to inflammation in his elbow, and he'll now officially sit out for another few turns through the rotation following his latest diagnosis. Kyle Hendricks started in Steele's place against the Pirates and figures to serve as Chicago's fifth starter while the left-hander is sidelined.