Kolb was hurt at the end of an 8-yard scramble in the first quarter. He remained in the game for four more plays, until the drive ended with a 2-yard touchdown run by
Washington won 30-7.
Kolb was 2 for 4 for 16 yards and had two runs for 12 yards Saturday when he left the game.
Kolb has suffered at least two concussions over six NFL seasons. Selected by the Philadelphia Eagles in the second round of the 2007 draft, he lost the starting job to Michael Vick when he was sidelined by a concussion in the season opener in 2010.
Kolb spent the past two seasons in Arizona, where he failed to secure the starting job because of an assortment of injuries, including a concussion in 2011. He switched to a new helmet the following year, one meant to give additional protection to the back of his head.