Fadrhonc left the Netherlands for Greece to coach AEK Athens FC in the 1975 football season. He stayed until the beginning of 1978. During that period, he led AEK to the semi-finals of the UEFA Cup in 1976 and the Greek Championship title in 1978.
In the UEFA Cup campaign of 1976, he is credited with the substitution of regular goalkeeper Lakis Stergioudas with veteran Nikos Christidis in extra-time of the second leg of the encounter against QPR. His move was justified when Christidis stopped two penalties and AEK went through to the semi finals. He died aged 66 in Nicosia, Cyprus.