The former first-rounder retired from the NFL, according to the NFL Transactions report.
He started 10 games in his rookie season, and then was benched in favor of Kyle Orton in 2014. Manuel never regained the full-time starting job in his final two seasons in Buffalo before joining the Oakland Raiders in 2017. The Raiders parted ways with him in September 2018, leading to Manuel joining the Chiefs in February.
On his career, Manuel appeared in 30 games with 18 starts, completing 343 of 590 passes for 3,767 yards and 20 touchdowns against 16 interceptions. He posted a 6-12 record as a starter and a 77.1 passer rating.