Kansas City Chiefs running back Isiah Pacheco left Monday's game against the Las Vegas Raiders with a concussion in the second half and did not return. Pacheco returned to game action against the Raiders after missing the previous two games with a shoulder injury. He scored a touchdown on a 12-yard run but otherwise had little impact in his return, rushing 11 times for 26 yards and catching four passes for zero yards. The Chiefs before the Raiders game placed veteran running back Jerick McKinnon on the injured reserve list with a groin injury. They finished the Raiders game with Clyde Edwards-Helaire and La'Mikal Perine at running back. Perine was signed off the practice squad before the Raiders game to take McKinnon's roster spot.