[7][8][9] Marley took gold at the next European under-22s held in Poreč, Croatia, in March 2022, defeating Italy's Roberto Lizzi via unanimous decision in the final.

[10][11][12][13][14] In May 2022, he made his senior international debut at the European Amateur Boxing Championships in Armenia but lost in his opening fight against Greece's Vagkan Nanitzanian when an accidental clash of heads in round two caused a cut above Marley's eye leading to an early stoppage and a defeat on points.

[15][16][17][18] Marley won a silver medal at the 2023 European Games in Kraków, Poland, losing to Aziz Abbes Mouhiidine from Italy in the final but securing his place at the 2024 Summer Olympics in the process.

[3][4][18][19][20][21] The result made him the first Irish heavyweight medalist at a major championships since Gearóid Ó Colmáin won the European title in 1947.

[4][25] Two months later, at the 2024 European Amateur Boxing Championships in Belgrade, Serbia, he went out in the first round, losing via split decision to Belgian fighter Victor Schelstraete.