Cook injured his shoulder late in the third quarter in the Minnesota Vikings' 28-24 victory over the Detroit Lions on Sunday, while David Montgomery hurt his right knee and ankle in the first quarter of the Chicago Bears' 23-20 last-second win over the Houston Texans.
Neither injury is believed to be particularly serious at this point and both running backs will be considered day-to-day, according to their coaches.
Cook was enjoying his best game of the young season before getting hurt on a play where he fumbled on a first-down run near midfield in the final minute of the third quarter.
He lost control of the ball when he ran into the back of his left guard Ezra Cleveland and the Lions recovered. It was uncertain if he got hurt when he collided with Cleveland or in the ensuing scrum while trying to recover the fumble.
Vikings coach Kevin O’Connell said during the postgame press conference that Cook will have some tests done. A shoulder injury last season forced Cook to miss one game.
Prior to the injury, Cook scored his first touchdown of the season and finished the day with a season-high 96 rushing yards.
Montgomery was coming off one of his best games of his career, rushing for 122 yards on just 15 carries in last Sunday’s 27-10 loss to the Green Bay Packers, but he carried the ball just three times for 11 yards against the Texans before exiting.
He was injured when his right leg got rolled up under him when he was blocking on a pass play. He was able to walk off the field under his own power.
After the game, Bears coach Matt Eberflus said it appears Montgomery avoided anything serious.
Second-year backup Khalil Herbert stepped up in Montgomery’s absence, rushing for 157 yards and two touchdowns on 20 carries.
The Bears finished with 281 rushing yards – their most in a game since September 30, 1984, when they ran for 283 yards, including 155 from Hall-of-Famer Walter Payton – in a 23-14 loss to the Dallas Cowboys.