Jamal Lewis joined Norwich as an academy scholar in the summer of 2014. . He was previously at Luton Town and nearly joined Brentford in 2011, two years after Luton dropped out of the Football League and were restricted in retaining players in their academy. A loophole kept Lewis at Luton until he parted ways with the Hatters to concentrate on his athletics career, finishing sixth in the 800m at the English Schools’ Championship at U17 level in 2013 and second in the English Schools’ U17 cross-country at Donington Park the following year.
In March 2016, he was called up to the Northern Ireland Under-19 squad
On 3rd May 2016, it was announced that Jamal had been offered a two year professional contract. He will be part of the development squad.
On 8th June 2017, Jamal played for Northern Ireland's Under-21s against Estonia. The Irish won 2-1
An impressive 2017 pre-season was cut short through injury but he returned and made his debut in the 2-1 home defeat to Brentford on 22nd December 2017. This was followed by his full debut in the 2-0 away win at Birmingham on 26th December 2017. His first professional goal was at Stamford Bridge in the FA Cup Third Round Reply when Lewis' 94th minute header drew Norwich level and took the tie into extra-time. Unfortunately Chelsea won on penalties.
In March 2018 he was called up to the full Northern Ireland squad for the first time. He made his debut on 24th March 2018 playing the full game in a 2-1 win over South Korea.
Lewis finished the 2017/18 season with 24 appearances and 1 goal. His form saw him linked on 27th June with Bournemouth and Watford whilst West Ham, Burnley and Celtic were said to be monitoring him. He is reportedly valued at £10m by Norwich.
On 26th March 2019, Lewis, along with Max Aarons and Teemu Pukki, were named in the Sky Bet Championship Team of the Season. The team was voted on by all 24 managers and head coaches from the Championship, with City having the highest representation in the eleven with three, ahead of Leeds United (2) and Sheffield United (2). He finished the 2018/19 season with 44 appearances as first choice as Norwich won the Championship title and promotion to the Premier League.