DeMarco Murray is expected to miss some time with an MCL injury but the Dallas Cowboys might be looking to permanently replace the running back.

NFL Media Insider Ian Rapoport reported on NFL Network's "NFL GameDay Morning" that the Cowboys no longer are sold on Murray as a franchise running back. The Cowboys have had internal discussions about upgrading the position "possibly in a big way" as we gear up to the trading deadline Rapoport reported.

Murray has been the Cowboys' best running back since being drafted in the third round of the 2011 NFL Draft and it really hasn't been close.

Murray earned 84 percent of the Cowboys' rushing yards and 75 percent of the carries through six weeks this season. The Cowboys don't have another healthy runner who can create creases and churn out yards.