Dunn appears set to be optioned to Triple-A Nashville prior to Wednesday's game versus the Pirates, Curt Hogg of the Milwaukee Journal Sentinel reports.
The Brewers haven't announced any transactions as Wednesday's 1:10 p.m. ET opening pitch approaches, but Dunn no longer had a locker in the clubhouse. Dunn has slashed just .192/.240/.255 since April 16 and has seen his playing time slip, so his expected demotion doesn't come as a surprise.