Kansas City announced the signing on Friday night. Amerson, 26, played the first two seasons of his career with the Washington Redskins after being a second round pick in the 2013 NFL Draft. He was signed off of waivers in 2015 by the Oakland Raiders. Amerson had 18 tackles, four passes defensed and a fumble recovery in six starts last season for Oakland.
The 6-foot-1, 205-pound defender has 249 tackles, three tackles for a loss, two forced fumbles and a fumble recovery in 68 career appearances. Amerson also has eight interceptions, with two interception returns for a touchdown, and 68 career passes defensed. He has 56 starts during his five-year NFL tenure.
Oakland signed Amerson to a four-year, $38 million contract in 2016, but the club released him on February 5, two days before his base salary would have become guaranteed.
Amerson dealt with shoulder and foot injuries and a concussion last season.
A source told NFL Network that his new contract is for one year and worth up to $6 million.
The Raiders and Chiefs split their two-game AFC West series in 2017.