Las Vegas Raiders star tight end Darren Waller suffered a hamstring injury in Monday night's 30-29 loss to the Kansas City Chiefs.
Waller, who was on the sideline in street clothes to begin the second half, exited in the first quarter.
The tight end departed without recording a reception or target.
The Raiders entered the prime-time contest already without tight end Foster Moreau. The former fourth-round pick had recorded six catches for 74 yards in three games this season.
Waller ranked third on the team in receptions (16) and receiving yards (175) before Monday's game.
