Mattison has played 18 career games but always as a backup. He had 124 carries for 569 yards in his career before last week when he replaced Cook and ran for a career-high 112 yards on 20 carries.
“I guess the best compliment I can give Matt is that when Dalvin leaves the game, I don’t change my mindset at all,” offensive coordinator Gary Kubiak said, via Courtney Cronin of ESPN. “I mean he’s a fine, young player, is playing behind a very established player in this league, so he’s got a great example in front of him. Matt is a three-down player. He understands pass protections, catches