Denver Broncos wide receiver Wes Welker is undergoing concussion evaluation and will not be a full participant in practice until Friday at the earliest. Broncos interim coach Jack Del Rio said that Welker, who was injured in Sunday's win over the Kansas City Chiefs, will undergo baseline concussion testing at some point Monday. By NFL protocol, Welker will be limited in practice this week and is permitted to make a full return to practice Friday at the earliest, only if doctors say he has passed the baseline test. "First concern obviously is that he's ready to return when doctors give him the green light," Del Rio said. "When he's able to go, he'll go." Welker's status for next Sunday's showdown with the New England Patriots -- his former team -- is uncertain, but sources told ESPN NFL Insider Chris Mortensen that the star receiver is expected to be OK. Welker sustained the injury on a 20-yard catch-and-run play in the fourth quarter Sunday, when he was tackled by Chiefs defensive end Allen Bailey but also was hit in the helmet by safety Eric Berry. Welker started to leave the field and then took a knee.