As DeAngelo Williams (left foot) sat out against the Rams, Jonathan Stewart managed 30 yards on 14 carries.
With Williams hobbling in the locker room Monday and saying only, "I'm doing my best to get back on the field," the Panthers have dropped to 28th in the league in rushing.
After a team-best 1,133 yards rushing last season, Stewart has 178 yards in seven games and is averaging 2.8 yards a carry behind an offensive line that's struggled to block.
"Did you see any holes?" Stewart said Monday, reluctant to talk. "As an offensive unit, we're just not making enough plays. Point blank."