Brach signed a minor-league contract with Atlanta on Sunday that includes an invitation to major-league camp, Justin Toscano of The Atlanta Journal-Constitution reports.
The Reds released Brach on Friday.
Brach was designated for assignment by the Reds on Monday.
Brach (shoulder) was activated from the 10-day injured list Sunday.
Brach (shoulder) will begin a rehab assignment at Triple-A Louisville on Wednesday, Bobby Nightengale of The Cincinnati Enquirer reports.
Brach (shoulder) threw a side session Saturday and is expected to begin a rehab assignment at Triple-A Louisville during the upcoming week, Bobby Nightengale of The Cincinnati Enquirer reports.
The Reds placed Brach on the 10-day injured list Sunday with a right shoulder impingement.
Despite allowing a run in the seventh inning Monday against the Cubs, Brach recorded his ninth hold of the season.
The Reds placed Brach's teammate Tejay Antone back on the IL on Saturday, C. Trent Rosecrans of The Athletic reports. Brach, who notched a save on Thursday, could be in line for more opportunities.
Brach fired a scoreless ninth inning, allowing a hit while striking out two to secure the save over the Nationals on Thursday.