Week 1 of the 2013 NFL regular season is just a month away now, and Chicago fans won't be ge..."/> Week 1 of the 2013 NFL regular season is just a month away now, and Chicago fans won't be ge..."/>

Chicago Bears Defense will look vastly different in 2013

Oct 2, 2011; Chicago, IL, USA; Chicago Bears middle linebacker Brian Urlacher (54) and the Chicago Bears defense during the second half against the Carolina Panthers at Soldier Field. The Bears beat the Panthers 34-29. Mandatory Credit: Rob Grabowski-USA TODAY Sports
Oct 2, 2011; Chicago, IL, USA; Chicago Bears middle linebacker Brian Urlacher (54) and the Chicago Bears defense during the second half against the Carolina Panthers at Soldier Field. The Bears beat the Panthers 34-29. Mandatory Credit: Rob Grabowski-USA TODAY Sports /
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Oct 2, 2011; Chicago, IL, USA; Chicago Bears middle linebacker Brian Urlacher (54) and the Chicago Bears defense during the second half against the Carolina Panthers at Soldier Field. The Bears beat the Panthers 34-29. Mandatory Credit: Rob Grabowski-USA TODAY Sports
Oct 2, 2011; Chicago, IL, USA; Chicago Bears middle linebacker Brian Urlacher (54) and the Chicago Bears defense during the second half against the Carolina Panthers at Soldier Field. The Bears beat the Panthers 34-29. Mandatory Credit: Rob Grabowski-USA TODAY Sports /

Week 1 of the 2013 NFL regular season is just a month away now, and Chicago fans won’t be getting to see the same Bears defense that has been among the NFL’s best for the past decade. Four times in the past eights seasons the Bears have ranked in the top-10 in terms of total yards allowed on defense.

But this offseason, the Bears lost linebackers Brian Urlacher and Nick Roach, and defensive lineman Matt Toeaina and Israel Idonije to free agency.

Idonije was second on the team in sacks with 7.5.

To replace the loss of Urlacher at MLB, the team signed D.J. Williams, who last week suffered a calf strain, and has been categorized as week-to-week, making his availability for the start of the season a big question mark.

With Williams sidelined, the Bears will look toward rookie linebacker Jon Bostic to fill the void for time being, and he could very well be the starting MLB next to Lance Briggs when the regular season opens.