Toussaint cleared waivers Thursday and was sent outright to Triple-A Charlotte, Vinnie Duber of AllCHGO.com reports.
The White Sox designated Toussaint for assignment Tuesday, LaMond Pope of the Chicago Tribune reports.
The White Sox selected Toussaint's contract from Triple-A Charlotte on Monday.
The White Sox outrighted Toussaint to Triple-A Charlotte on Tuesday, Daryl Van Schouwen of the Chicago Sun-Times reports.
The White Sox designated Toussaint for assignment Sunday.
Toussaint agreed to a one-year, $1.3 million deal with the White Sox on Thursday, avoiding arbitration, Daryl Van Schouwen of the Chicago Sun-Times reports.
Toussaint did not factor into the decision Thursday, allowing one run on three hits and three walks over four innings in a 3-1 victory over the Diamondbacks. He struck out four.
Toussaint came away with a no-decision Friday in the White Sox's 3-2 loss to the Red Sox, allowing one run on five hits and two walks over 6.1 innings. He struck out two.
Toussaint (4-7) picked up the win in Saturday's 7-6 victory over the Twins, allowing one run on three hits and a walk over five innings. He struck out eight.
Toussaint (2-7) allowed three runs on five hits and two walks over 5.1 innings Friday, striking out six and taking a loss against Detroit.