The Green Bay Packers have reportedly signed linebacker Brandon Chillar to a 4 year contract extension for 21 million dollars with 7 million guaranteed.   Chillar was signed as an unrestricted free agent from the St. Louis Rams prior to the 2008 season.   He worked his way into the starting lineup until suffering a broken hand a month ago.  This is the first veteran contract extension completed by the Packers this season as the NFL is heading into an uncapped season in 2010.  The signing could impact a couple of other players, Aaron Kampman, who is on injured reserve and has an expiring contract at the end of this season, and possibly A.J.Hawk who was supplanted in the starting lineup by Chillar.