Dan Koppen

Koppen is out for the season after tearing his left ACL on Sunday in 9-on-7 drills, just five weeks after rejoining the Denver Broncos following J.D. Walton's setback in his comeback from ankle surgery.

Posted: Jul. 28, 2013 3:13 PM ET | Last Updated: Jul. 28, 2013 9:30 PM ET

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 medical tests. Manny Ramirez, who took most of the snaps at center during Denver's offseason practices, stepped in for Koppen.