Scunthorpe United Sellars-Fleming is a youth product of Lowlands JFC and Phoenix United FC, before moving to
Scunthorpe United in 2020. He signed his first academy contract in 2021 and being promoted in 26 May of the same year. On 17 February 2023, he moved to
Gainsborough Trinity on a short-term loan in the
Northern Premier League.
Hull City On 21 August 2023, he moved to
Hull City on a 2+1 year contract where he was originally assigned to their youth sides. On 2 November 2024, Sellars-Fleming signed a new two-and-a-half year contract with
Hull City. On 14 February 2025, Sellars-Fleming joined
Gateshead on loan until the end of the season. before being extended for a further three months. On the conclusion of his loan spell on 8 January 2026, he returned to Hull. On 9 January 2026, he signed for
EFL League Two side
Grimsby Town on a loan deal until the end of the season. He scored his first goal for the club and subsequently his first goal in the
EFL in a 1–0 win over
Accrington Stanley on 11 February 2026. ==Personal life==