Gnahoua began playing American football in 2011, joining a local semi-pro team, the Caïmans 72 du Mans [fr], as a sixteen-year old.[1] He was drawn to the sport after watching a National Football League game on television with his cousin and had his first practice with the Caïmans three days later.[2][3] Without any cleats of his own, he first practiced in Air Jordans.[4]
In 2016, he arrived in Canada, playing one season of collegiate football for the McGill Redmen before a sudden increase in international student tuition forced him to return to France.[5] In his sole season at McGill, he played nine games and recorded 24 tackles, four tackles for loss, one sack and one fumble recovery.[6]
Professional career
Return to France and Berlin Rebels
Gnahoua rejoined the Caïmans 72 du Mans in France in 2017, playing well enough early on in the campaign to get signed by the Berlin Rebels of the German Football League (GFL) midway through the 2017 GFL season.[7] In seven games that season, he registered 25 solo tackles, 13 tackles for loss, and seven sacks.[8] Gnahoua began the 2018 season with the Blue Stars de Marseille [fr] in France, helping them reach the league semifinals, before returning to the Berlin Rebels to finish the 2018 GFL season.[8]
Hamilton Tiger-Cats
In 2019, he was announced as one of the 18 European players invited to the 2019 CFL Combine in Toronto.[9] The following month, in April, he was selected by the Hamilton Tiger-Cats as the first overall pick in the inaugural European CFL draft, part of commissioner Randy Ambrosie's initiative to grow the league's presence internationally.[10][11] He began the season as a member of the practice squad,[12] but made his debut during their week 9 matchup against the BC Lions on August 10, recovering an onside kick that led to a second-quarter field goal in the 35-34 victory.[13] The Tiger-Cats reached the 107th Grey Cup, where they lost to the Winnipeg Blue Bombers.
Gnahoua signed a contract extension with the Tiger-Cats on December 29, 2020.[14] He was placed on the suspended list on July 19, 2021, but was later activated and played in the first regular season game of 2021.[15][16]
Gnahoua became a free agent upon the expiry of his contract on February 14, 2023.[17] In three seasons with the team, he played 38 games and recorded one defensive tackle, 11 special teams tackles, one forced fumble, and one blocked punt.[6]
Saskatchewan Roughriders
On February 17, 2023, it was announced that Gnahoua had signed with the Saskatchewan Roughriders.[18] During training camp, he was released by the team on May 17 to reach the 75-man roster limit.[19]
On July 10, 2023, Gnahoua re-signed with the Hamilton Tiger-Cats as a member of their practice roster.[4][21] He was subsequently released on November 5.
Paris Musketeers (second stint)
In 2024, Gnahoua returned to the Paris Musketeers.