The promotion announced the change to the welterweight bout on Tuesday. The nature of Dalby’s injury was not revealed. UFC Vegas 100 — also known as UFC Fight Night 247 — takes place at the UFC Apex in Las Vegas and is headlined by a welterweight clash pitting Carlos Prates against Neil Magny.
Scroggin will take a 7-0 record into his promotional debut. The Kansas native has competed exclusively for the Fighting Alliance Championship organization during his professional tenure, finishing all but one of his opponents inside the distance.
Dos Santos is coming off a unanimous decision loss to Randy Brown at UFC 302 this past June.