Brian Urlacher’s prospects for playing in Week 1 just went from probable to questionable. (Charles Rex Arbogast/AP)

“I have never had a scope,” Urlacher told WFLD Fox-32. “I don’t know how that stuff works. This is the first time I have ever done anything to my knee so I am kind of new to this. I don’t know. Honestly, I don’t know how that works.”

The question was a fair one after Urlacher missed a week of team activities — it just came one day early.

Urlacher underwent arthroscopic surgery Tuesday morning according to a Chicago Tribune report. And while the Bears have maintained their belief that the eight-time Pro Bowl selection will be ready for the start of the regular season, with only 26 days left before Chicago opens up against Indianapolis, the prospect of missing time is increasingly likely.

Durability has been a strength for Urlacher over a 12-year pro career in which he played all 16 games in six of the last seven seasons. In 2009 he dislocated his wrist in Week 1 against Green Bay and underwent surgery that cost him the rest of the season. Last season he sprained the MCL and PCL in his left knee in the final week of the regular season.

Urlacher, who has not practiced since July 31 due to swelling in his knee, had 102 tackles and three interceptions for a Chicago defense that ranked 17th in average yards allowed per game.

The Bears host the Redskins in a preseason game on Saturday.

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