Longelo started playing Sunday league football as a nine-year old for Euro Dagenham. He joined West Ham United's under-10 side playing as a midfielder and scored five goals on his debut, against Chelsea. Due to his pace he was moved to play as a striker. Playing for West Ham's under-23 team, Longelo played as a left-back.[3] On 21 September 2020, Longelo made his debut for West Ham in a 5–1 EFL Cup win against Hull City.[4]
Birmingham City
He joined Birmingham City on a season-long loan on 30 August 2022.[5] After recovering from injuries suffered earlier in the season,[6] he made his debut on 1 October, starting at left wing-back in a 1–1 draw away to Championship leaders Sheffield United.[7] In a 2–0 win over Queens Park Rangers on 28 October, he "received the ball on the left, twisted and turned past Ethan Laird and then found the bottom-right corner with a low curling finish"[8] to score his first senior goal, and later gave away a penalty which was saved by John Ruddy.[9]
Longelo signed a three-and-a-half-year contract with Birmingham City on 31 January 2023. The fee, officially undisclosed, was reported by football.london as £400,000.[10][11] He lost his place for a time, but came back into the team at the end of the season, which he finished with 23 league appearances.[12][13][14] He began the 2023–24 season as a regular in the matchday squad,[15] and he and Cody Drameh had a run in the starting eleven when both full back, Ethan Laird and Lee Buchanan, were injured at the same time.[16] When Laird regained fitness, it was Longelo who lost the starting place,[17] and after Wayne Rooney was replaced as manager in January 2024, he did not play in the league again.[18][19]
^Longelo spent the first half of the 2022–23 season on loan from West Ham United.
^Soccerbase currently lists Longelo as an unused substitute for the FA Cup tie against Wigan Athletic on 30 November; he came on during extra time.[28]