A full-back, Haslam played for Rochdale as an amateur, before moving to Oldham Athletic in 1946–47, for whom he made two League appearances.
[2] After a short spell with Brighton & Hove Albion he moved to Leyton Orient for 1948-49, with whom he made seven league appearances, before joining Guildford City.
[5] Haslam became manager of Luton Town in 1972 and he led them to promotion to the Football League First Division for 1974–75.
[7] Under Haslam's management, Sheffield United almost signed Argentinian footballer Diego Maradona who was then 17 years old.
However the agreed fee was increased and Maradona, who had made his way to the airport, had to remain in Argentina for the time being.