DENVER -- Left tackle Matt Light was helped off the field early in the first minute of the fourth quarter with what appeared to be a knee injury.

He was replaced by 6-foot-8, 315-pound rookie Sebastien Vollmer, a second-round pick out of the University of Houston.

Light has started every game the past three seasons. He hasn't missed a start since 2005, when he suffered a season-ending ankle injury in the third game that year.