Koenig (elbow) transferred his rehab assignment to Triple-A Nashville on Tuesday and could be activated from the injured list in about a week, Todd Rosiak of the Milwaukee Journal Sentinel reports.
The left-hander landed on the shelf with an elbow sprain in early April and has allowed one run on six hits with a 2:4 K:BB across 4.2 frames in five rehab appearances. The Brewers will likely look to pitch Koenig on back-to-back days at Nashville before reinstating him from the IL.