The Reds traded Wiemer and Jonathan India to the Royals on Friday in exchange for Brady Singer.
The Reds optioned Wiemer to Triple-A Louisville on Wednesday.
The Reds recalled Wiemer from Triple-A Louisville on Sunday.
The Brewers optioned Wiemer to Triple-A Nashville on Sunday.
The Brewers activated Wiemer (knee) from the 10-day injured list Monday.
Wiemer (knee) went 1-for-3 with a run scored in his first rehab game with Triple-A Nashville on Thursday.
Brewers manager Pat Murphy said Sunday that Wiemer (knee) is expected to be sidelined for 2-to-3 weeks, Curt Hogg of the Milwaukee Journal Sentinel reports.
Wiemer was diagnosed with a strained popliteus muscle in his left knee Saturday, Curt Hogg of the Milwaukee Journal Sentinel reports.
The Brewers placed Wiemer (knee) on the 10-day IL on Saturday.
Wiemer was removed from Friday's game versus the Cubs with an apparent left knee injury, Curt Hogg of the Milwaukee Journal Sentinel reports.