Just when it appeared the Panthers were getting some production out of running back Jonathan Stewart, he injured his knee and was unable to return in Sunday's loss to the Saints.

Early in the second half, Stewart reeled off a 16-yard run, followed by a 16-yard catch-and-run. But at the end of his receiving play, he took a hit to the knee and was forced to exit the game.

Now, it appears he may have done some damage.

According to ESPN's Adam Schefter, the Panthers fear that Stewart tore his MCL on the play. If so, that would end his season.

Stewart was banged up to start the season, so the Panthers will be comfortable with having just DeAngelo Williams and Mike Tolbert at running back.

But having Stewart did add depth to the running back position — an area the Panthers have been spending a ton of money on.

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Aaron Wilson covers the Ravens for The Baltimore Sun.