Ronnie Rivers has PCL sprain

The Rams believe RB Ronnie Rivers has a PCL sprain that "could keep him out a few weeks," according to NFL Network's Ian Rapoport. It's particularly noteworthy with RB Kyren Williams dealing with an ankle injury. Rookie Zach Evans is the only healthy RB on the Rams' active roster. RB Royce Freeman is on the practice squad.

Update: Rivers has a Grade 3 PCL sprain and is expected to miss 4-5 weeks, according to Rapoport. Rivers figures to land on short-term IR.