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Broncos receiver Wes Welker sustained a concussion against the Chiefs last week.

If you think that's going to keep him off the field on Sunday for his return to New England, think again. Welker practiced Thursday on a limited basis and remains under concussion protocol, waiting to be cleared for contact.

PHOTOS: Manning-Brady through the years | Week 12 picks

But it's hard to imagine anything keeping him from facing the Patriots. In addition to the fact that the Broncos need him—tight end Julius Thomas (knee) is also limited—Welker has a long history with the Patriots and coach Bill Belichick. Once he left the organization, Welker didn't express glowing admiration for this old coach, either.

"It was just kind of hard," Welker told Sports Illustrated, "one of those deals where you have to endure him, put up with him. ... But he does it to everybody. It's the way he is."