Fedde is slated to serve as the bulk reliever in Friday's game versus the Tigers, Evan Woodbery of MLive.com reports.
Lefty Brandon Eisert will open for the White Sox before handing things off to the right-handed Fedde. It will be the seventh bulk relief assignment this season for Fedde, who holds a 4.73 ERA and 19:12 K:BB over 26.2 frames in his first seven outings in such situations.