Chicago Bears running back David Montgomery will miss at least three games after being placed on injured reserve Saturday because of a knee injury.
Ryan Nall was flexed from the practice squad to provide backfield depth in a corresponding roster move.
Montgomery suffered a left knee sprain during the Bears' Week 4 win over the Detroit Lions. It represented the first significant injury setback of his NFL career after he played 31 of a possible 32 games across his first two seasons.
The 24-year-old Iowa State product has been one of the league's most dependable rushers since being selected in the third round of the 2019 draft.