On May 3, 2018, Chapman was selected with the first overall pick in the 2018 CFL Draft by the Hamilton Tiger-Cats, after trading up with the Montreal Alouettes.[1] Despite this, Chapman remained unsigned through May 20, 2018, despite the Tiger-Cats signing several other players that they drafted.[2] Chapman attended one of the Tiger-Cats early regular season games, but left without having signed a contract.[3]
NFL
On May 14, 2018, Chapman received a tryout for the New York Giants of the NFL.[4] Chapman signed a contract with the Denver Broncos on July 25, 2018.[5][6] He was waived by the Broncos on September 1, 2018.[7]
AAF
In September 2018 Chapman decided to sign with the Salt Lake Stallions of the Alliance of American Football (AAF), who would begin play in February 2019.[8] However, Chapman never played for the Stallions, citing personal reasons.[9]