Denver Broncos linebacker Louis Green left the field on a stretcher with a neck injury and a concussion in the first quarter of Saturday's preseason game against Houston.
The 6-foot-3, 237-pound Green collided with teammate D.J. Williams as the two converged to tackle Texans tight end Owen Daniels, who caught a short pass.
Green lay motionless for several minutes as medical staff rushed to check on him. Green was strapped to the stretcher and was moving his fingers and hands as he was rolled off the field.
The Texans said Green was taken to a hospital for further evaluation, but has since been released. Green will accompany the team back to Denver on their charter flight.
Green had replaced Boss Bailey, who sprained his right ankle and limped off the field on the Texans' second play from scrimmage.
The 28-year-old Green, starting his fifth NFL season, played in all 16 games for Denver in 2007 and finished with nine tackles.