Atlanta designated Herget for assignment Wednesday.
The transaction clears a spot on the 40-man roster for utility man Cavan Biggio, whose contract was selected from Triple-A Gwinnett. After being acquired from the Angels in early May, Herget made eight appearances out of Atlanta bullpen, logging a 4.38 ERA, 1.30 WHIP and 15:3 K:BB in 12.1 innings. He was optioned to Gwinnett on Aug. 19 and will likely stick around with the Triple-A club if he clears waivers.