Atlanta acquired Jackson and outfielder Jorge Soler from San Francisco on Monday in exchange for infielder Sabin Ceballos and left-hander Tyler Matzek (elbow), Ken Rosenthal of The Athletic reports.
Jackson will head back to Atlanta after spending time in the organization from 2017 through 2021, including winning a World Series title in his final season with the club. The right-hander possesses an inflated 5.40 ERA and 1.43 WHIP while striking out 33 batters over 35 innings in 36 appearances with the Giants this season. Jackson will provide Atlanta with another experienced right-handed arm out of the bullpen.