Montgomery, who carried the ball five times in a six-play span in the Thursday night win over the Chicago Bears, reportedly suffered the injury on his first run of the night.
The Packers could use a running back that can be a weapon in the passing game. He then left Thursday night's game with a chest injury, and Ian Rapoport of NFL Network later reported broken ribs for Montgomery.
Jones was impressive over the summer, but it took injuries to Montgomery and Williams for him to finally get an opportunity. The 24-year-old finished the 2016 season with 77 carries for 457 rushing yards and three touchdowns.
How many snaps the fifth-round pick receives moving forward will likely depend on the health of the other two backs, but Jones maximized his minutes and made a case for more playing time.
The Packers next play at Dallas on Sunday, Oct. 8.
Keep an eye on him when waivers hit this week. Montgomery's backup, Jamaal Williams, was also ruled out of the game after sustaining a knee injury in the second quarter.
Jones is a safety valve but at least worth considering with Green Bay's backfield dealing with so many health concerns.