1st(1st leg) NAC Breda - 1. FC Magdeburg 0:0 (0:0)
2nd (2nd leg) 1. FC Magdeburg - NAC Breda 2:0 (0:0)
1st(1st leg): 13/09/1973 2nd (2nd leg): 03/10/1973 Winner: 1. FC Magdeburg
1st(1st leg) PFC Beroe - CS FOLA Esch 7:0 (4:0)
2nd (2nd leg) CS FOLA Esch - PFC Beroe 1:4 (0:1)
1st(1st leg): 19/09/1973 2nd (2nd leg): 22/09/1973 Winner: PFC Beroe
1st(1st leg) FC Reipas Lahti (old) - Olympique Lyonnais 0:0 (0:0)
2nd (2nd leg) Olympique Lyonnais - FC Reipas Lahti (old) 2:0 (1:0)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: Olympique Lyonnais
1st(1st leg) Randers Freja - Rapid Wien 0:0 (0:0)
2nd (2nd leg) Rapid Wien - Randers Freja 2:1 (1:0)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: Rapid Wien
1st(1st leg) AC Milan - Dinamo Zagreb 3:1 (2:0)
2nd (2nd leg) Dinamo Zagreb - AC Milan 0:1 (0:1)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: AC Milan
1st(1st leg) Gżira United - SK Brann 0:2 (0:1)
2nd (2nd leg) SK Brann - Gżira United 7:0 (1:0)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: SK Brann
1st(1st leg) Chimia Râmnicu-Vâlcea - Glentoran FC 2:2 (2:1)
2nd (2nd leg) Glentoran FC - Chimia Râmnicu-Vâlcea 2:0 (1:0)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: Glentoran FC
1st(1st leg) Torpedo Moskva - Athletic Bilbao 0:0 (0:0)
2nd (2nd leg) Athletic Bilbao - Torpedo Moskva 2:0 (1:0)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: Athletic Bilbao
1st(1st leg) Budapesti Vasas - Sunderland AFC 0:2 (0:0)
2nd (2nd leg) Sunderland AFC - Budapesti Vasas 1:0 (0:0)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: Sunderland AFC
1st(1st leg) Legia Warszawa - PAOK Saloniki 1:1 (0:0)
2nd (2nd leg) PAOK Saloniki - Legia Warszawa 1:0 (0:0)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: PAOK Saloniki
1st(1st leg) Pezoporikos Larnaca - Malmö FF 0:0 (0:0)
2nd (2nd leg) Malmö FF - Pezoporikos Larnaca 11:0 (6:0)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: Malmö FF
1st(1st leg) Cardiff City - Sporting CP 0:0 (0:0)
2nd (2nd leg) Sporting CP - Cardiff City 2:1 (1:1)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: Sporting CP
1st(1st leg) TJ Baník Ostrava OKD - Cork Hibernians 1:0 (1:0)
2nd (2nd leg) Cork Hibernians - TJ Baník Ostrava OKD 1:2 (0:1)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: TJ Baník Ostrava OKD
1st(1st leg) MKE Ankaragücü - Rangers FC 0:2 (0:1)
2nd (2nd leg) Rangers FC - MKE Ankaragücü 4:0 (3:0)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: Rangers FC
1st(1st leg) RSC Anderlecht - FC Zürich 3:2 (0:2)
2nd (2nd leg) FC Zürich - RSC Anderlecht 1:0 (1:0)
1st(1st leg): 19/09/1973 2nd (2nd leg): 03/10/1973 Winner: FC Zürich
1st(1st leg) ÍBV Vestmannaeyjar - Bor. Mönchengladbach 0:7 (0:3)
2nd (2nd leg) Bor. Mönchengladbach - ÍBV Vestmannaeyjar 9:1 (6:0)
1st(1st leg): 20/09/1973 2nd (2nd leg): 03/10/1973 Winner: Bor. Mönchengladbach