Burnley

Richardson was born in Moston, Manchester and had his first trial at Burnley at the age of eight.^[3] In November 2018, he raised eyebrows when he scored 5 goals against Crewe Alexandra on his debut for Burnley under-18's at the age of 15.^[3] A few months later in February 2019, once he had turned 16, he made his debut for the under-23 side managed by Steve Stone.^[3] He scored a hat-trick against Rochdale in the Lancashire Senior Cup semi-final, having come on as a substitute at half-time.^[3] He subsequently became a regular member of the under-23 squad for the remainder of the 2018–19 season, regularly playing against players many years older than him.^[3] Burnley made sure to tie Richardson down to a two-year scholarship in July 2019, amid interest from fellow Premier League side Tottenham Hotspur.^[3]

In August 2019, still aged 16, he made the squad for the first team for an EFL Cup tie against League One Sunderland at Turf Moor.^[3] However, he remained an unusued substitute as the Clarets were knocked out after they lost 3–1.^[3] On his 17th birthday in February 2020, Richardson signed his first professional contract with the club until the summer of 2022.^[4] Back and hamstring injuries slightly hampered his progress in the second half of the season but he still scored a total of 7 goals for the under-18 and under-23 squads.^[3] He was placed into the first-team bubble by manager Sean Dyche before the 2020–21 season commenced and played in some pre-season friendlies.^[3] He made his professional debut for the first-team in a 4–0 Premier League loss to Tottenham Hotspur on 28 February 2021, replacing Jay Rodriguez as a late substitute.^[5] At 18 years and 21 days, he became Burnley's youngest Premier League debutant.^[6]