Sitton, 30, is a former fourth-round pick of the Packers back in 2008. He was surprisingly cut loose by Green Bay coming out of the preseason after they were unable to trade him.
The Bears quickly signed him to a three-year, $21.75 million contract that includes $10 million guaranteed.
In 2016, Sitton has appeared in six games for the Bears and is rated by Pro Football Focus as the No. 4 guard out of 78 qualifying players.