The Brewers placed Wilson on the 15-day injured list Tuesday with a right oblique strain, Adam McCalvy of MLB.com reports.
Wilson evidently must have tweaked his oblique at some point during a 3.1-inning relief appearance in Sunday's extra-innings loss to the Reds. He will be eligible to return Sept. 17, but it's not yet clear whether he will have a chance to be ready by that date.