Washington Redskins safety Brandon Meriweather and receiver Aldrick Robinson were both knocked out of Sunday night's game before it started as they were involved in an odd collision in pregame warm-ups.
Meriweather was preparing to play his first game of the season after battling a knee injury.
But during pregame drills, he was running a route toward the end zone, and when he attempted to catch a ball, he slammed into Robinson, who was looking at the ground in the end zone. Robinson was not wearing a helmet, and he was hit in the head by Meriweather's right knee, according to the Washington Times.
Robinson remained on the ground for about 10 minutes before walking off with assistance from trainers.
Both were made inactive for Sunday's game.