After center Dan Koppen suffered a season-ending injury in Sunday's practice quarterback Peyton Manning worked with Manny Ramirez in training camp on Monday.
Ramirez a five-year veteran from Texas Tech made 11 starts at right guard for the Broncos last season.
Koppen who took over at center last year after an injury to J.D. Walton tore his anterior cruciate ligament in his left knee on Sunday.
Guard/center C.J. Davis who was held out of Sunday's practice with an ankle in jury he suffered Saturday returned to the field. He worked as a center with backup quarterback Brock Osweiler.
Steve Vallos who was signed as a free agent after Koppen's injury joined practice for the first time. He practiced at center during the offensive line's positional drills.