Chelsea
Born in Southampton,[2] Colwill joined Chelsea at under-9 level,[3] having previously played for City Central.[4]
2021–22 season: Loan to Huddersfield Town
In June 2021, he joined Championship club Huddersfield Town on loan.[5][6] He made his professional debut in a 4–2 penalty shootout win against Sheffield Wednesday in the EFL Cup on 1 August 2021.[7] He scored his first goal for Huddersfield, a late winner, in a 2–1 win at Sheffield United on 21 August 2021.[8] Throughout the season he suffered from ankle, knee and hip problems, as well as COVID-19.[9] On 29 May 2022, Colwill scored an own-goal as Huddersfield lost 1–0 to Nottingham Forest in the 2021–22 Championship play-off final.[10]
On 5 August 2022, Colwill joined fellow Premier League side Brighton & Hove Albion on loan for the duration of the 2022–23 season.[11][12] He made his Seagulls and Premier League debut two days later against Manchester United, coming on as a 90+1st minute substitute for Solly March in Brighton's first ever win at Old Trafford after winning 2–1.[13]