*Club domestic league appearances and goals, correct as of 12:55, 15 December 2024 (UTC) ‡ National team caps and goals, correct as of 22:11, 29 March 2023 (UTC)
On 13 August 2020, he signed a season-long loan with League Two club Cheltenham Town.[5] Griffiths kept a clean sheet on his professional debut in an EFL Cup 1–0 away win over Peterborough United in September 2020.[6] Griffiths impressed on loan at Cheltenham, winning the club's Young Player of the Season award after keeping 23 clean sheets in 50 appearances as he played his part in a season which saw Cheltenham crowned League Two Champions.[7]
Following his first loan spell, signed a new four-year contract with West Bromwich Albion, keeping him with the club until the summer of 2025.[8] In July 2021 he moved on loan for the 2021–22 season to League One side Lincoln City.[9][10] He made his Lincoln City debut away to Gillingham on the opening day of the 2021–22 season.[11] On 5 March 2022, he suffered a season-ending ankle injury against Sheffield Wednesday.[12]
On 14 July 2022, Griffiths signed for Portsmouth for the 2022–23 season on a season-long loan.[13][14] He made his debut for Portsmouth away to Sheffield Wednesday on the opening day of the 2022–23 season, starting in a 3–3 draw.[15] The loan was terminated by West Bromwich Albion on 11 January 2023, following 28 appearances for Portsmouth.[16][17]
On 15 February 2023,Griffiths made his West Bromwich Albion debut in a 1–1 home draw against Blackburn Rovers.[18]
In June 2024, he signed a new three-year contract.[19]
On 10 July 2024, Griffiths joined League One club Bristol Rovers on a season-long loan deal.[20][21]
On 15 March 2021, Griffiths received his first England U21 call up as part of the Young Lions squad for the 2021 UEFA European Under-21 Championship.[24] He had to wait two years to make his debut for them however, with his first cap coming on 28 March 2023 in a 2–1 defeat against Croatia.[25]