Edmondson joined the youth academy of Blackburn Rovers at the age of 6, and worked his way up all their youth categories, debuting with their U21s at the age of 15.
On 17 November 2022, he signed his first professional contract with the club until June 2025.[2]
He started training with the senior team in the preseason in the summer of 2023.[3] On 30 August 2023, Edmondson made his professional debut for Blackburn Rovers in the club's 8–0 EFL Cup win over Harrogate Town at Wetherby Road. Replacing Andrew Moran in the 63rd minute, Edmondson scored the club's 8th goal of the game and the first of his professional career in the 75th minute.[4]
On 21 October 2024, Edmondson joined Macclesfield on loan.[5]