West Bromwich Albion Early career Fellows joined
West Bromwich Albion at under-10s level. On 6 July 2021, he signed his first professional contract with the club, penning a three-year deal until 2024. He made his professional debut for the club on 25 August 2021, starting in a 6–0
EFL Cup second round defeat to
Arsenal. He made his league debut on 11 December 2021, coming on as a substitute for
Callum Robinson in a 1–0 win against
Reading.
Crawley Town (loan) On 1 September 2022, Fellows joined
EFL League Two club
Crawley Town on a season-long loan. He made his debut for the club on 3 September 2022, in a 2–2 draw with
Salford City.
First-team breakthrough On 7 January 2024, Fellows scored his first career goal in a 4–1 home win against
Aldershot Town in a FA Cup third round game. Six days later, he scored his first league goal in a 4–1 home win against
Blackburn Rovers. On 26 January 2024, he signed a new contract with the club until 2027. He was named the clubs
2023–24 Young Player of the Year for his performances during the season. He won the award for a second time the following season.
Southampton On 29 August 2025, Fellows joined
Southampton on a four-year contract, for a reported initial fee of £8 million, plus £2 million in potential add-ons. He made his debut for the club on 14 September in a 0–0 with
Portsmouth. ==International career==