Longelo joined West Ham as a nine-year-old, and instantly made a name for himself as he scored five goals in his first Under 10s match.

From there, he worked his way through the ranks at the Hammers and went on to feature for consistently for the Under 18 and Under 23 side.

After featuring heavily for the 18s and 23s, he made his debut for the West Ham first-team in 2020 in the EFL Cup against Hull City. His second senior appearance came a year later on the European stage, with Longelo starting and playing the full 90 minutes in a Europa League clash against Dinamo Zagreb.

In August 2022, Longelo joined Birmingham City on loan in the Championship. In his first season at St Andrews, he played 25 times for the Blues in a successful season.

As a result of the impressive campaign, Longelo moved to Birmingham on a permanent deal in the summer of 2023 for an undisclosed fee. A change in manager midway through the season limited game time and for the 24/25 season, he joined Cambridge United on loan.