Lamb won't return to Sunday's game at Kansas City due to a concussion, Calvin Watkins of The Dallas Morning News reports.
Lamb may have been injured when he attempted to break up a Dak Prescott interception at the end of the first half, when his helmet hit the turf as he landed. The second-year wide receiver stayed down for a few seconds and then didn't emerge from the locker room after halftime with his teammates. With a concussion confirmed, Lamb is in danger of missing Thursday's game against the Raiders, as is Amari Cooper, who won't suit up next week after testing positive for COVID-19 on Friday.