The New England Patriots suffered a potentially critical loss on Sunday as starting rookie left tackle Will Campbell left with a knee injury against the Bengals and was carted off minutes later.

Campbell's injury happened with just under five minutes to play in the third quarter as the Patriots were holding on to a 17-13 lead. New England went on earn an ugly 26-20 victory.

Trainers came onto the field and could be seen examining Campbell's right leg, focusing on his knee. Before he was helped off the field.

Moments later, Campbell was driven away from the sideline on a cart, with a towel covering his face.

The Patriots declared Campbell questionable to return with a knee injury. He was later declared out for the game.

New England's offensive line had a difficult day on Sunday. Left g

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