Chargers' Mathews carted off field with injury
Mathews fumbled on the play, but it was recovered by teammate Eddie Royal.
Now in his fifth year, Mathews has a history of injuries. He made it through a full season for the first time last year, gaining a career-high 1,255 yards. He played through an ankle sprain late in the season, but was forced out of a playoff loss at Denver by the injury.
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