Cleveland Browns middle linebacker D'Qwell Jackson left Sunday's game with the New York Giants with a head injury and will not return.
Jackson, one of the team's defensive leaders, was hurt in the second quarter, when the Browns allowed 20 points.
Giants tight end Martellus Bennett returned in the second quarter after suffering a left knee injury. Bennett was hurt in the first quarter, but was back on the field midway through the second period. He had been injured while blocking on a running play.
The Giants also said backup running back Andre Brown was being examined for a head injury after taking a hard hit on a kickoff return.
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