Carolina Panthers head coach Ron Rivera met with the media Wednesday and expressed that he doesn't know how long starting running back Jonathan Stewart will be out of action with a hamstring injury.

"It could be two weeks, three weeks, four weeks. I just don't know," Rivera said, before adding the veteran won't be put on short-term injured reserve.

Stewart sustained the injury in the first quarter of Sunday's game after carrying the ball five times for nine yards and catching two passes for seven yards.

Fozzy Whittaker took up the majority of the rushing duties from then on, but Mike Tolbert should also see an increase in snaps.