Draughn (knee) did not sustain a serious injury, yet the 49ers are still exploring other options at running back, Matt Maiocco of CSN Bay Area reports.

Draughn underwent an MRI on Monday, and while he apparently avoided a major injury, it's still possible he'll miss one (or both) of the final two games of the season. The healthy running backs on the current roster are Kendall Gaskins and DuJuan Harris, with rookie Mike Davis (hand) eligible to return from short-term injured reserve in Week 17. At this stage, it's unclear which players will get most of the carries in Sunday's game against the Lions. If Draughn can't play, the 49ers will likely make another roster move, after dropping Travaris Cadet in favor of Harris on Tuesday.