The Chicago Bears opened a 21-day evaluation window Wednesday to decide if left guard Cody Whitehair will return after placing him on injured reserve last month because of a right knee injury.

The 30-year-old Whitehair was injured in a loss to the New York Giants on Oct. 2. He has been a fixture on the Bears line at center and guard since they drafted him in the second round in 2016, starting 99 games.