The Brewers placed Hall on the 15-day injured list Friday with a left pec strain, Curt Hogg of the Milwaukee Journal Sentinel reports.
Hall had to leave an appearance Thursday against the Giants due to the injury, and an MRI revealed a strain. The 27-year-old lefty is expected to miss roughly 4-to-6 weeks, per Hogg, which lines him up to return right around the All-Star break.