Mattison is on track to serve as Minnesota's lead back Sunday against the Rams after Dalvin Cook was placed on the reserve/COVID-19 list Thursday, Chris Tomasson of the St. Paul Pioneer Press reports.

EDGE Analysis

The Vikings haven't revealed whether Cook was placed on the list due to a positive test for the virus, but because he's unvaccinated, the 26-year-old running back will have to complete a five-day quarantine even if he was deemed a close contact of an infected person. If he tested positive for the virus, Cook would be subject to a 10-day quarantine, which would provide him with enough time to get cleared ahead of a Jan. 2 game against the Packers in Week 17, albeit without the benefit of any practice beforehand. In any case, since he'll be picking up at least one start sans Cook, Mattison looks like a strong lineup option in just about any fantasy format. In his prior three starts while Cook was sidelined Weeks 3, 5 and 13, Mattison played at least two-thirds of the Vikings' offensive snaps and averaged 24.3 carries, 6.0 targets and 149.3 yards from scrimmage per game while reaching the end zone twice.