The Buffalo Bills had four major impending free agents on their interior offensive line depth chart, and to this point, they've re-signed two of them. Kraig Urbik received a four-year contract extension in December, and then the team re-signed Colin Brown to an extension on Friday, per SiriusXM radio host Adam Caplan. Terms of the deal were not disclosed, though Caplan says it's a two-year deal.

Brown, who will be 28 in August, has been a member of the Bills' active roster for the past two seasons. He closed out the 2011 season as the team's starting center when Urbik and Eric Wood succumbed to injury, then cracked the back end of the roster again in 2012. The 6'7", 326-pound lineman eventually landed on IR with a hamstring injury. He'll be back with the team in 2013 to again fight for a spot on the depth chart at both center and guard.

The Brown re-signing leaves the Bills with two more free agents on the interior line: Andy Levitre, who might be the top guard on the free agent market this season, and his primary backup, Chad Rinehart.

Editor's Note: Mike Florio of Pro Football Talk has the contract numbers. Brown will make $1.445 million dollars over two years. There is an in-depth breakdown through the link if you're interested in split salaries and all that. - MRW