Aiken, 23, originally entered the NFL as a rookie free agent with Buffalo out of Central Florida in 2011. The 6-foot-2, 213-pounder began his rookie season on the Buffalo practice squad before being signed to the 53-man roster in November. He played in two games as a reserve. Aiken was released by Buffalo after training camp this past summer and spent time on the practice squads of both Buffalo and Chicago this season. He will wear jersey #16.