Wacha was placed on the 15-day injured list Friday, retroactive to July 5, with right shoulder inflammation.
Wacha has been unable to start this week due to a "heavy arm," and he's now been diagnosed with shoulder inflammation. It doesn't appear to be a serious injury, as up until Thursday the Red Sox still expected the right-hander to start Friday. He'll be eligible to be reinstated after the All-Star break. Connor Seabold was recalled in a corresponding move and will start Friday versus the Yankees.