Cook has a chest injury and reportedly won’t play Monday night.
Vikings coach Mike Zimmer said Thursday only that “he seems to be doing good” when asked about Cook.
Mattison has an ankle injury that kept him out of Week 15 but sounds as if he has a better chance to play than Cook.
“He’s doing better. He’s got a good chance,” Zimmer said.
“Yeah, we have a lot of confidence in Mike,” Zimmer said. “He’s done a good job, did a good job last week. Hopefully, we don’t need him.”