The Vikings already had ruled out Cook with his chest injury.
They listed Mattison, who has a high-ankle sprain, as questionable. But Mattison will miss a second consecutive game after the Vikings listed him among their inactives.
The Packers are healthy entering tonight’s game. Their inactives are receiver Ryan Grant, running back Dexter Williams, cornerback Tony Brown, cornerback Ka’dar Hollman, offensive tackle Alex Light, offensive tackle John Leglue and tight end Jace Sternberger.
Defensive lineman Dean Lowry, the only player the Packers listed as questionable, is dressed despite an ankle injury.