The Kansas City Chiefs announced on Tuesday that the club has waived defensive back Neiko Thorpe and signed center Bryan Mattison.

Mattison (6-3, 310) initially joined the Chiefs on Sept. 26 and was inactive for one contest before being released by the club on Oct. 6. He has played in 15 games (four starts) in two NFL seasons with St. Louis (2011) and Baltimore (2010). He spent two seasons (2008-09) on the Ravens practice squad before moving to the 53-man roster. He originally entered the NFL as an undrafted rookie free agent with the Jets in 2008. He was a two-year captain at the University of Iowa, where he played on the defensive line. He was named first-team All-State by the Associated Press at Penn High School in Mishawaka, Ind.

Thorpe (6-2, 185) originally joined the Chiefs as an undrafted rookie free agent in 2012 and was promoted to the active roster from the Chiefs practice squad on Oct. 6. He saw action on special teams in one contest vs. Baltimore on Oct. 7. He played in 51 games (40 starts) at Auburn, compiling 279 tackles (172 solo), seven interceptions returned for 189 yards (27.0 avg.), 35 passes defensed, two forced fumbles, a fumble recovery and a blocked field goal returned for a touchdown. He was an Under Armour All-American at Tucker High School in Tucker, Ga.

— Chiefs Media Relations —