On Monday's practice, starting center Luke Wattenberg went down with an injury. Denver Broncos center Luke Wattenberg left practice on MondayWattenberg went down during a drill, according to Zac Stevens, and then got looked at by trainers. He did not practice the rest of the session:Luke Wattenberg went down hard in a drill. He's emerged as one of the best pass-protecting centers in the NFL during his short starting stint with the Broncos as well. The primary backup is Alex Forsyth, who has filled in nicely for the Broncos when Wattenberg can't play, but the Broncos did give him a major extension during the season for a reason.