Born in Herlev to Nigerian parents,[1] Chukwuani started playing football in the youth of B.93 before moving to the youth academy of Superliga club FC Nordsjælland. He practiced with the first team at age 14, and head coach Flemming Pedersen stated that he was "one of the top players of the future".[2] In July 2019, Chukwuani signed a three-year contract, keeping him in Nordsjælland until 2022.[3]
On 22 September 2019, Chukwuani made his professional debut in the Superliga in a 2–1 home win over AaB, thereby becoming the sixth youngest player to appear in a game in the league.[4] He came on as a substitute in the 82nd minute for Magnus Kofod Andersen.[5] On 17 July 2020, Chukwuani scored his first senior goal in a 6–3 away loss to eventual champions Midtjylland.[6] With the goal, he became the club's youngest scorer in league history, a record that was broken the following season by teammate Andreas Schjelderup at 16 years and 284 days.[7] He finished the season with 9 total appearances his which he scored one goal.[8]
On 5 April 2022, it was reported that Chukwuani had signed with Italian Serie A club Hellas Verona. Among others, the well-known transfer journalist Fabrizio Romano posted a picture of Chukwuani back in April, wearing a Verona jersey.[9] However, according to an Italian newspaper on 14 July 2022, Chukwuani failed the medical check in Verona because the medical staff had found a minor heart defect and as there were strict rules in Italy regarding heart problems, the transfer was no longer possible.[10]
Lyngby
After training with Lyngby Boldklub for several weeks, the club confirmed on 31 August 2022, that Chukwuani had signed a two-year deal with the newly promoted Danish Superliga team.[11] He made his debut for the club on 4 September, starting in a 2–0 home loss to Randers.[12] On 7 May 2023, he scored his first goal for De Kongeblå, opening the score in the second minute of a 2–1 league victory against Midtjylland.[13]
Sturm Graz
On 20 March 2024, it was announced that Chukwuani would be joining Austrian club Sturm Graz from the summer.[14]