Jackson was optioned by the Dodgers on Saturday, Fabian Ardaya of The Athletic reports.
Jackson pitched well enough in his second start of the year Friday against the Rockies, allowing on run over 4.2 innings of work, but he'll head to the minors nonetheless. Edwin Uceta will take his spot on the roster, giving the Dodgers and extra bullpen arm, but Jackson could return once rosters expand in September.