Dulwich Hamlet youngster Diallang Jaiyesimi played for Norwich City's Under-18s in their 7-0 defeat to Chelsea on 31st October 2015. He then played and scored against Arsenal in November and featuring in victories over West Ham United and Leicester City.
On 2nd January 2016, he signed a two and a half year contract with Norwich, joining as a second year scholar. City fought off competition from several other Premier League clubs to sign Jaiyesimi, who was captain of Dulwich's FA Youth Cup side this season while also making five appearances for their first-team
Diallang scored eight goals in 33 games for Norwich's Under-23s in 2016/17.
On 9th August 2017 he joined Grimsby Town on a season long loan. Norwich's former youth development coach Paul Wilkinson is Assistant Manager at Grimsby. Diallang has been handed the number 20 shirt. Mariners' manager Russell Slade said “We’ve watched him play recently in a pre-season game against Sutton and he was really outstanding. Powerful, really quick, can play on the left, can play on the right and can play number 10”