Reynolds (ribs) was designated to return from injured reserve Thursday, Dave Birkett of the Detroit Free Press reports.
Reynolds suffered the injury in Week 9's win over the Packers and was placed on IR on Nov. 9. He now has a 21-day window to either be added back to the active roster or revert to IR for the remainder of the season. Before suffering the injury, Reynolds operated as the team's No. 3 running back, a role that Justin Jackson has since occupied.