Born in London, Addai was scouted for Arsenal's academy as a goalkeeper aged 10, having played in the position in a Sunday league game despite usually playing outfield.[2] He joined Coventry City in 2014, signing his first professional contract with the club two years later.[3][4] He joined Hendon on a youth loan in January 2018.[4][5] He made five appearances for the club in all competitions.[5] He joined Isthmian League Premier Division club Dulwich Hamlet on loan in March 2018.[6] Addai scored a 90th-minute winner for the club with a free-kick from inside his own half in their 1–0 Velocity Trophy semi-final win over Brentwood Town on 7 March 2018.[6][7] On 10 April 2018, he was recalled from his loan, having made 7 appearances.[7]
On 26 July 2019, it was announced that Addai would join AFC Telford United on a month's loan from 2 August to 2 September.[8] He made seven league appearances on loan at the club.[1] On 12 September 2019, he joined Southern League club Redditch United on loan until January 2020.[9] He made three league appearances for the club.[10] Addai left Coventry at the end of January 2020 after his contract was cancelled by mutual consent.[11]
Barnsley
Addai joined Barnsley in September 2020 following a trial at the club.[12] In November 2020, he joined National League club Chesterfield on a one-month loan.[13] He made two appearances on loan at the club.[1] He was released by Barnsley at the end of the season.[14]
Esbjerg fB
In September 2021, he joined Danish Danish 1st Division club Esbjerg fB on a one-year deal, having spent the 2021–22 pre-season on trial at Portsmouth.[15] He made four league appearances over the course of the 2021–22 season.[1]
Crawley Town
Addai signed for Crawley Town in July 2022.[16] On 30 July 2022, he debuted for Crawley during a 0–1 loss to Carlisle.[17]
Born in England, Addai was called up to the Jamaica national team in May 2022,[19] and made his unofficial debut in a 6–0 loss to Catalonia in the same month, replacing Dillon Barnes in the 56th minute.[20]
Personal life
Addai was born in England to a Ghanaian father and Jamaican mother.[21]