The Vikings placed Scott Crichton on season-ending injured reserve and promoted fellow defensive end Zach Moore from the practice squad.
Crichton suffered a concussion in last week's loss to the Cardinals. He was unable to practice this week. The team officially ruled him out Friday for Sunday's game against the Bears at TFC Bank Stadium. Crichton, a 2014 third-round draft pick, had played in every game this season, averaging 11 snaps a game on defense. He recorded eight tackles.
Moore, who attended college at Concordia (St. Paul), spent the first 14 weeks of the season on the practice squad. He won a Super Bowl ring with the Patriots last season after playing eight games for them with one start.