Kansas City Chiefs' Isiah Pacheco suffers concussion in game against Las Vegas Raiders.
Raiders emerge victorious with a 20-14 win.
Pacheco's helmet flew off during a play in the third quarter.
He was struck in the head by a teammate's knee during the tackle.
Pacheco left the field with 3:16 remaining in the quarter.
Unfortunately, he was ruled out for the rest of the game.
This marked Pacheco's comeback after missing two games due to shoulder surgery.
His performance included 11 carries, 26 yards, one touchdown, and four catches for no yards.
Pacheco's fumble as a quarterback led to an 8-yard touchdown for the Raiders.