The Kansas City Chiefs are opening the 21-day practice window for starting cornerback Jaylen Watson, ESPN reported Friday.Watson, 26, has been on injured reserve since Oct. 22 with a broken ankle that required surgery. He sustained the injury in Kansas City’s Week 7 win at San Francisco.The Chiefs were optimistic at the time that Watson could return for the playoffs. The Chiefs (15-1) are the No. 1 seed in the AFC and will have a bye week after finishing the regular season Sunday at Denver.