The Broncos have agreed with former Patriots C Dan Koppen on a one-year contract, ESPN Boston's Mike Reiss reported Monday.
Koppen, who turns 33 on Wednesday, has made 120 career starts at center, all with New England. The Patriots released him on Aug. 31. Koppen played just one game in 2011 because of an ankle injury.
J.D. Walton is the Broncos' starting center, with C.J. Davis listed as the backup on the depth chart.