Passley was born on November 17, 1994, in Lewisham, London, England. He is 27 years old and holds British nationality. Passley began his football career at Fulham’s youth academy and made his professional debut for the club in 2014. He later went on loan to Portsmouth, where he played in both the League Two and the National League. Passley has also had stints at Dagenham & Redbridge and Ebbsfleet United before joining Bromley FC in 2021.