Toussaint will take the mound for Sunday's series finale against the Diamondbacks, David O'Brien of The Athletic reports.
Toussaint will remain in the rotation as manager Brian Snitker sticks with a six-man staff for the time being. The right-hander was dealt the loss during his last outing Monday against Boston, allowing three earned runs on four hits and two walks while striking out six across 4.2 innings.