Kansas City Chiefs running back Isiah Pacheco was ruled out in the second half of the club’s 20-14 loss against the Las Vegas Raiders on Monday, Christmas Day, with a concussion. The RB lost his helmet after making a reception late in the third quarter and then took a knee to the head before exiting.

Pacheco had just returned to action against the Raiders after missing the previous two games with a shoulder injury. He scored a touchdown on a 12-yard run in his return, rushing 11 times for 26 yards and catching four passes for zero yards. Kansas City finished Monday’s game with Clyde Edwards-Helaire and La’Mical Perine at running back. Perine was signed off the practice squad before the game to take McKinnon’s roster spot.

The Chiefs also placed veteran running back Jerick McKinnon on the injured reserve list with a groin injury before the game.

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