 After the reorganization of Yugoslav football, they played in newly established Yugoslav Second League A Zone from 1955 until 1958, finishing on 5th, 8th and 10th place.This league system was then changed again and Ljubljana was relegated back to Slovenian Republic League.They have won it three times, in 1963, 1967 and 1968, before finally returning to Yugoslav Second League, where they played until 1972.