Matt Gillies brought Johnson on as a coach at Leicester City in 1959.
He was originally signed as head scout, but soon become Gillies' assistant manager.
He was influential in the signing of both Dave Gibson and Mike Stringfellow, both of whom would become key figure in Leicester's success during the 1960s.
Johnson is often credited as having come up with a tactical innovation of switching the positions of Frank McLintock and Graham Cross, upsetting the traditional 1-11 formation.
[2] Gillies said on the innovation: "confused opposition" as opposition players would often be asked to mark "our [Leicester's] number eight, so they thought Cross was their man, when McLintock had replaced him" as "players hadn't got beyond thinking about numbers then.