NFL • Broncos center Dan Koppen is out for the season after tearing his left ACL on Sunday in 9-on-7 drills, less than six weeks after rejoining Denver following J.D. Walton's setback in his comeback from ankle surgery.
Koppen, an 11-year veteran who played his first nine seasons with the Patriots, was caught in a pile early in the workout and was carted off the field and taken for an MRI.
Manny Ramirez, who took most of the snaps at center during Denver's offseason practices, stepped in for Koppen, whose teams have gone 108-28 in games he has started. Later in the day, the Broncos signed free-agent center Steve Vallos, pending a physical. Vallos is a six-year veteran who has played in Seattle, Cleveland, Philadelphia and Jacksonville with nine career starts.