Table:
text: List of NSL champions
NSL Cup Winners
NSL Cup Winners
Season Cup_FinalDate WinningTeam Score LosingTeam Cup_Final_Attendance
1984 13 September 1984 Newcastle Rosebud United (1) 1–0 Melbourne Knights 5000
1985 11 August 1985 Sydney Olympic (2) 2–1 Preston Lions 11187
1986 17 September 1986 Sydney City (1) 3–2 (a.e.t.) West Adelaide 5200
1987 14 October 1987 18 October 1987 Sydney United (1) 1–0 1–0 South Melbourne 5,845 6,000
1988 14 August 1988 APIA Leichhardt (2) 0–0 (5-3 Penalties) Brunswick Juventus 5200
1989 20 August 1989 Adelaide City (2) 2–0 Sydney Olympic 10000
1989–90 25 April 1990 South Melbourne (1) 4–1 Sydney Olympic 7000
1990–91 7 April 1991 Parramatta Eagles (1) 1–0 Preston Lions 8749
1991–92 7 April 1992 Adelaide City (3) 2–1 Marconi Stallions 6500

Question: Which team lost in the NSL champions list on August 20, 1989?