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Los Angeles Chargers star Khalil Mack suffered a gruesome arm injury early in the team’s game against the Las Vegas Raiders on Monday night.

Mack and his teammate Troy Dye were chasing down Raiders wide receiver Tre Tucker toward the end of the first quarter. Mack’s left arm appeared to get jammed underneath Dye as they both went for the ball carrier.

The star pass-rusher immediately came out of the game as the quarter came to a close. The Chargers said initially that Mack was questionable to return due to an elbow injury, but was downgraded to out after he was seen on the sideline with his pads off and his arm in a sling.

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The Chargers were a top defense last season, finishing first in points allowed and 11th in yards

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