With the news that center J.D. Walton could be out until mid-October, the Broncos looked to a familiar face in free agency to help fill the void.
Denver agreed to terms with free agent center Dan Koppen Thursday.
Koppen started 12 regular-season games and one playoff contest for the Broncos in 2012 after Walton injured his left ankle four games into the season.
The NFL's all-time winningest offensive lineman, Koppen won two Super Bowls as a member of the New England Patriots -- the team with which he spent his first nine NFL seasons.