 But the offer to become a professional footballer was a tough decision to make for O'Callaghan as he had been accepted into Loughborough College to undertake a physical education teaching diploma.He signed the contract, deferring college for a year in case the football did not work out.After six months in Donny's reserves he was promoted to the first team and he developed a fine partnership with Peter Kitchen and he top scored in 1975–76 with 28 goals.