The Dodgers optioned Jackson to Triple-A Oklahoma City on Wednesday.
Jackson looked like a candidate to fill multiple innings behind starter Tony Gonsolin (ankle) in the latter's return from the injured list Wednesday against the Pirates, but Jackson will instead be sent back to Triple-A to clear a spot on the 26-man active roster for Gonsolin. Over his 11.1 innings out of the Los Angeles bullpen this season, Jackson has posted a 7.94 ERA.