Holmberg was optioned to Triple-A Charlotte on Friday.

Holmberg, who has been with the White Sox since May, has been an oft-used reliever since being bumped out of the starting rotation, posting a 5.45 ERA over his last 18 appearances. Nonetheless, he serves as the roster casualty with Reynaldo Lopez being recalled ahead of his White Sox debut Friday. Holmberg will return to Triple-A for now, where he posted a 1.76 ERA over 15.1 innings earlier this season before being brought up.

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