For the third time in 10 months, Wes Welker has been diagnosed with a concussion. The latest head injury for the Broncos wide receiver happened in the second quarter of Denver's 18-17 loss to Houston on Saturday. Broncos coach John Fox confirmed the injury, but he didn't offer a timetable for when Welker might return. "It was determined it was a concussion," Fox said. "He'll go through the protocol. The biggest thing on him is, of course, player safety. He'll go through the protocol. ... He won't come back until he's ready to come back." Welker suffered the concussion after taking a hit from Texans safety D.J. Swearinger with under a minute left to play in the first half. After taking the hit, Welker waved to the sideline for help.