The Carolina Panthers are awaiting MRI results on running back Jonathan Stewart's hamstring, but head coach Ron Rivera says the team believes Stewart will miss at least a week or two.

Stewart was injured in early in the Panthers' 46-27 victory over the San Francisco 49ers on Sunday. He rushed five times for nine yards before exiting. 

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Fozzy Whittaker took over the lead back role for Stewart and gained 100 yards on 16 carries. He added 31 yards on three catches. Whitaker rushed for a total of 108 yards last season.

Stewart, 29, led the Panthers backfield with 989 rushing yards last season.