One of the best players in Chicago Bears history will be absent for the team's centennial celebration this weekend. Hall-of-Fame linebacker Brian Urlacher announced on Twitter Friday that he won't be participating in Bears100 after all because he's come down with a stomach bug

“Unfortunately I won't be able to attend the Bears100,” Urlacher tweeted on Friday morning. “Something I ate must have got the best of me. Sorry I won't be able to see all you Bears fans! #BearDown”

The ninth overall pick of the 2000 NFL Draft, Urlacher went on to play his entire 13-year career in Chicago, establishing himself as one of the greatest middle linebackers in NFL history. He was Defensive Rookie of the Year, made eight Pro Bowls, was named to five All-Pro Teams, and in 2005 won Defensive Player of the Year. Urlacher finished his career with 1,354 tackles, 41 and-a-half sacks, 22 interceptions, and two defensive touchdowns. He was inducted into the Pro Football Hall of Fame last year, his first of eligibility.

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Bears100 is a weekend celebration of the franchise's 100 years of existence that begins on Friday evening and ends on Sunday. The event is being held at the Donald E. Stephens Convention Center in Rosemont, IL, and allows fans unprecedented access to some of the most notable players in team history via autograph booths, discussion panels, and even physical and video-game activities.

Urlacher's main event was on Saturday morning, a panel called “Legacy: Hall of Fame linebackers” that includes fellow defensive legends Dick Butkus and Mike Singletary.