Kansas City Chiefs coach Romeo Crennel announced Wednesday that Brady Quinn will start at quarterback Sunday against Denver. Quinn returned last week from a concussion he suffered in an Oct. 28 loss to Oakland, replacing Matt Cassel in the second half of Sunday's loss to Cincinnati. Cassel will remain on the bench. Crennel gave Quinn his first start since the 2009 season on Oct. 14 against Tampa Bay, but after he was knocked out in the next game, Cassel became the team's starter again. Quinn completed 9 of 14 passes for 95 yards and was sacked twice against the Bengals.