Denver Broncos defensive coordinator Wade Phillips was taken to hospital during Sunday's game against San Diego after a Chargers player inadvertently knocked him down.
Phillips was sent flying in the second quarter when running back Melvin Gordon barrelled into him after going out of bounds.
He fell backward, appearing to hit the back of his head on the ground.
He was placed on a stretcher and immobilised before being lifted onto a cart and driven off the field.
The Broncos said he was alert and had movement in all of his extremities.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
Linebackers coach Reggie Herring took over play-calling duties for the defence.
