Broncos receiver Wes Welker initially was evaluated on the field for a neck injury during the Broncos' game Sunday night, and no concussion symptoms were apparent at that time, the team said Tuesday.

It wasn't until Welker was on the sideline several minutes later that he began experiencing symptoms consistent with a concussion. When those symptoms surfaced, the Broncos said their medical team followed the NFL's mandated concussion protocol and decided Welker should not return to the game.

After Welker's concussion was announced, there were questions about how the Broncos responded. But the medical team focused its initial evaluation on a neck injury.

To review, Welker, the Broncos' star slot receiver, made a nice catch-and-run for 20 yards with 11:22 left in the fourth quarter when he took a high-low blast from two Kansas City defenders. Welker's head was snapped back, and it was his neck that the Broncos' medical team evaluated. Aware there was a collision, Broncos doctors communicated with Welker, and at that time no concussion symptoms were apparent.

On the sideline, the Broncos cleared him to go back in. He made a 9-yard catch to finish the Broncos' drive that ended with a Matt Prater field goal.

It was after that series that the Broncos' medical team became aware Welker was experiencing possible concussion symptoms.

Upon evaluation, Welker was ruled out for the rest of the game. Don't be surprised if Welker shows up on the injury report Wednesday with a neck/concussion injury. He hopes to play Sunday night against his former team, the New England Patriots, in Foxborough, Mass., although his playing status likely won't be determined until Friday at the earliest.