Webb was recalled from Triple-A Gwinnett on Wednesday.
Webb was optioned to Triple-A Gwinnett on Aug. 17, and he allowed three runs on five hits and a walk while striking out six in 3.2 innings across four minor-league appearances since then. However, he'll provide an extra arm in Atlanta's bullpen since active rosters expanded Wednesday. The right-hander will serve mainly as a low-leverage reliever since he has a 4.29 ERA and 1.57 WHIP in 21 innings across 20 appearances with Atlanta in 2021.