Lions RB David Montgomery injured his right MCL in Sunday's loss to the Bills and will be out indefinitely. NFL Network's Ian Rapoport reports that it's a tear and that Montgomery might be out through the playoffs. ESPN's Adam Schefter reports it as a sprain but adds that Montgomery will have further testing. Whatever the specific diagnosis and return timeline, it seems a pretty safe bet that Montgomery will miss the rest of the regular season.

The hamstring injury Lions RB Jahmyr Gibbs suffered in Monday's practice is not believed to be serious. “I think we’re gonna be fine here," HC Dan Campbell said of Gibbs. "So, I think we’ll be good.” Insider Jordan Schultz, meanwhile, heard from a source that Gibbs "should be ready for Week 1."