He later became the then-youngest-ever player to start a UEFA Champions League match for the club and ultimately made eight appearances across all competitions before loan spells at West Bromwich Albion and Blackburn Rovers.

[7][8][9][10] His football career started at the age of five when he joined the youth system at Manchester City after he was spotted by the club's head of recruitment, Terry John, at a local five-a-side tournament.

[8][11] He briefly trained with cross-town rivals Manchester United and Blackburn Rovers but elected to remain with City, where he rapidly progressed through the youth ranks during his formative years.

[13] Adarabioyo's senior debut followed on 21 February 2016 when was named in a young starting XI by Manuel Pellegrini for City's FA Cup match against Chelsea, and he was lauded for a strong performance in marking opposition striker Diego Costa despite his side suffering a 5–1 defeat.

On 3 August 2018, Adarabioyo joined Championship side West Brom on a season-long loan and made his debut for the club four days later when he started in the right-back position in a 1–1 draw against Nottingham Forest.

[28][29] However, after losing and reclaiming his spot in the starting lineup, he developed into one of West Brom's more consistent performers by the turn of the year and was praised by Moore for showing "versatility, adaptability and an understanding of the game".

[30][31] In the new year, Mason Holgate arrived on a short-term deal from Everton which allowed Adarabioyo to return to his preferred position, where he predominantly featured for the remainder of the season as West Brom narrowly missed out on promotion to the Premier League.

[37][38] After an injury-enforced absence from the squad, he soon established himself in the first team where he formed a defensive partnership alongside Derrick Williams, Ryan Nyambe and Darragh Lenihan, and he scored his first senior career goal in Blackburn's 2–1 win over Sheffield Wednesday in November.

[39][40][41] His impressive performances during the first half of the season led to suggestions that he would return to Manchester City in January, with his parent club enduring an injury-crisis at the time, but Guardiola ultimately elected to employ midfielder Fernandinho as defensive cover rather than recall Adaraioyo.

[51][52] At the time of Adarabioyo's arrival, newly-promoted Fulham had lost their opening four league matches of the season and he was immediately introduced into the starting XI by manager Scott Parker, where he formed a strong partnership alongside Joachim Andersen, who had joined the club on the same day in a short-term deal from Olympique Lyonnais.

[53][54] Over the course of the season, he made what Sky Sports described as a "seamless transition" to the Premier League and delivered a number of impressive performances, including a clean sheet in a 1–0 win over reigning champions Liverpool in March, which saw him come into contention for an England call-up.

[76][77] Adarabioyo is an athletic ball-playing centre-back who was previously described as being "fast, strong in the air and [possessing] the quality to look forward behind the line for the next pass" by his former Manchester City manager Pep Guardiola.

[78] Standing at 6 ft 5 in, his height and physical presence have seen him emerge as a dominant defender who is adept at winning aerial duals and effecting headed clearances, while simultaneously posing as a goal threat from set-pieces in the opposition box.

[79] He has also earned recognition as a player who is strong in the tackle and capable with the ball at his feet, suitable to a possession-based style of play, and boasts good positional awareness and reading of the game in defensive situations.

[10] In December 2018, during the early years of his playing career, Adarabioyo's name was mentioned by teammate Raheem Sterling after he alleged that sections of the media served to "fuel racism" with their portrayal of young black footballers.