Nick Chubb carted off with knee injury

[Uncrowned Sports]

From profootballtalk:

TL;DR: Browns running back Nick Chubb suffered a serious knee injury and was carted off the field. The injury was so bad that announcers described it as horrifying, and a replay of the incident was shown to the crowd. Chubb had previously had reconstructive surgery on the same knee. After Chubb's injury, the Browns scored a touchdown and took the lead. Another player, Gunner Olszewski of the Steelers, is also being evaluated for a head injury.

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