According to Terez Paylor of the Kansas City Star, Welker was taken to the locker room to be evaluated by team trainers for a possible concussion.
Welker was noticeably roughed up by a physical Chiefs secondary all night. Chiefs cornerback Brandon Flowers was knocking Welker to the ground early and often on Sunday night. It's unclear on which play Welker left with a concussion, but he was taken to the locker room and missed a good portion of the fourth quarter.
Even with the time he missed, Welker caught eight of his 10 targets in the game for 72 yards. A handful of members of the Broncos' passing offense have dealt with bumps and bruises this season, including Peyton Manning. Denver's offense would take on a different feel if Welker was forced to miss any time. He has not missed a game since 2010.