Welker suffered a concussion in the second quarter and left Sunday's win over the Tennessee Titans. It's his second concussion in a month, making this one a bigger concern than usual. Welker is doubtful to pass the league's concussion protocol in time on such a short week. The Broncos aren't ready to rule Welker out yet, but he won't practice and will likely be listed as doubtful on the injury report.
Fantasy impact: It's a tough break for Welker owners heading into the playoff semifinals, but Demaryius Thomas, Eric Decker and Julius Thomas should all see a boost in targets. Keep an eye on Jacob Tamme, who played in the slot position in Welker's place and could assume that role again this week. He's worth picking up as a TE2 in deeper leagues.