From SB Nation the only outsider announced is Steve Breaston

UFAs that re-signed with Chiefs: RB Jackie Battle, WR Steve Breaston, WR Terrance Copper, CB Travis Daniels, S Jon McGraw, OT Ryan O'Callaghan, TE Leonard Pope, C Casey Wiegmann.
UFAs not re-signed: LB Charlie Anderson, FB Tim Castille, LB Corey Mays, C Rudy Niswanger and QB Brodie Croyle.
RFAs that re-signed with Chiefs: Mike Cox signed his RFA tender, Reshard Langford signed his exclusive rights tender.
RFAs not signed: CB Brandon Carr, OT Barry Richardson, DE Wallace Gilberry.