The Royals placed Wacha on the 7-day concussion injured list Tuesday, Anne Rogers of MLB.com reports.

EDGE Analysis

Wacha was involved in a minor off-the-field incident and is headed back to Kansas City to be evaluated further. He had been scheduled to start Wednesday, but that will no longer happen. Wacha will be eligible to return as soon as Sept. 16 versus the Mariners, but it's unclear at this point whether he will be ready by that date. The Royals have not announced a replacement for Wacha on Wednesday.