Wacha (arm) is likely to be placed on the 15-day injured list Friday, Ian Browne of MLB.com reports.
Wacha was already ruled out from his scheduled start Friday, and it now appears that he will be in for a lengthier absence. To this point, the right-hander has only been diagnosed with a "heavy arm," so he may be able to return shortly after the All-Star break. Connor Seabold is expected to enter the rotation in Wacha's place.