Welker was knocked out of the game on a 20-yard catch-and-run with 11:22 remaining. He appeared to lose control of the football on the play, but ultimately came out of the pile with the ball. He later returned to the game and caught a pass with 7:44 to play.
His status will be closely watched and dissected throughout the week.
Update:Welker did suffer a concussion. As ESPN.com Broncos reporter Jeff Legwold notes, Welker will be limited in practice this week. Even if he passes a baseline test on Monday, the earliest Welker could practice fully would be Friday, in accordance with the league's concussion protocol.