The Chiefs have officially placed S Eric Berry on injured reserve and signed S Reshard Langford.
Berry, arguably the Chiefs' best defensive player, suffered a torn ACL in Sunday's loss to the Bills.
Langford has played in six games in two seasons with the Chiefs. He has recorded eight special-teams tackles. Langford entered the NFL as an undrafted free agent with the Eagles in 2009.
The Chiefs also announced Wednesday that they have added FB Shane Bannon and OL Butch Lewis to the practice squad. TE Kyle Nelson and OL Lucas Patterson were dropped from the practice squad.