Chargers receiver Keenan Allen broke down in tears after suffering a knee injury in first game of the season

San Diego Chargers wide receiver Keenan Allen went down with a knee injury on Sunday during the first half against the Chiefs.

He had to be carted off the field, and reports say an ACL tear is likely.

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As he was carted off the field, Allen's emotions got the better of him. It was tough to watch:

It's just brutal news for Allen and the Chargers, who will now be without their top receiver for the remainder of the year.

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