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| 1st(1st leg) | Ards FC | - | Standard Liège | 3:2 (2:2) | ||
| 2nd (2nd leg) | Standard Liège | - | Ards FC | 6:1 (3:1) | ||
| 1st(1st leg): 12/09/1973 18:10 | 2nd (2nd leg): 19/09/1973 19:00 | Winner: Standard Liège | ||||
| 1st(1st leg) | Vitória Setúbal | - | K. Beerschot VAV | 2:0 (2:0) | ||
| 2nd (2nd leg) | K. Beerschot VAV | - | Vitória Setúbal | 0:2 (0:1) | ||
| 1st(1st leg): 12/09/1973 21:45 | 2nd (2nd leg): 26/09/1973 19:00 | Winner: Vitória Setúbal | ||||
| 1st(1st leg) | VfB Stuttgart | - | Olympiakos Nikosia | 9:0 (5:0) | ||
| 2nd (2nd leg) | Olympiakos Nikosia | - | VfB Stuttgart | 0:4 (0:2) | ||
| 1st(1st leg): 17/09/1973 19:00 | 2nd (2nd leg): 19/09/1973 15:45 | Winner: VfB Stuttgart | ||||
| 1st(1st leg) | Union Luxembourg | - | Olympique Marseille | 0:5 (0:3) | ||
| 2nd (2nd leg) | Olympique Marseille | - | Union Luxembourg | 7:1 (4:0) | ||
| 1st(1st leg): 18/09/1973 18:00 | 2nd (2nd leg): 03/10/1973 15:00 | Winner: Olympique Marseille | ||||
| 1st(1st leg) | Panathinaikos | - | OFK Beograd | 1:2 (0:1) | ||
| 2nd (2nd leg) | OFK Beograd | - | Panathinaikos | 0:1 (0:1) | ||
| 1st(1st leg): 19/09/1973 14:00 | 2nd (2nd leg): 03/10/1973 14:00 | Winner: OFK Beograd | ||||
| 1st(1st leg) | TJ Tatran Prešov | - | Velež Mostar | 4:2 (3:1) | ||
| 2nd (2nd leg) | Velež Mostar | - | TJ Tatran Prešov | 1:1 (0:1) | ||
| 1st(1st leg): 19/09/1973 14:00 | 2nd (2nd leg): 03/10/1973 16:00 | Winner: TJ Tatran Prešov | ||||
| 1st(1st leg) | Dinamo Tbilisi | - | Slavia Sofia | 4:1 (2:0) | ||
| 2nd (2nd leg) | Slavia Sofia | - | Dinamo Tbilisi | 2:0 (0:0) | ||
| 1st(1st leg): 19/09/1973 14:30 | 2nd (2nd leg): 03/10/1973 16:30 | Winner: Dinamo Tbilisi | ||||
| 1st(1st leg) | TJ VSS Košice | - | Budapest Honved SE | 1:0 (0:0) | ||
| 2nd (2nd leg) | Budapest Honved SE | - | TJ VSS Košice | 5:2 (2:2) | ||
| 1st(1st leg): 19/09/1973 14:30 | 2nd (2nd leg): 03/10/1973 16:00 | Winner: Budapest Honved SE | ||||
| 1st(1st leg) | Sliema Wanderers | - | Lokomotiv Plovdiv | 0:2 (0:2) | ||
| 2nd (2nd leg) | Lokomotiv Plovdiv | - | Sliema Wanderers | 1:0 (1:0) | ||
| 1st(1st leg): 19/09/1973 15:00 | 2nd (2nd leg): 02/10/1973 16:30 | Winner: Lokomotiv Plovdiv | ||||
| 1st(1st leg) | Eskişehirspor | - | 1. FC Köln | 0:0 (0:0) | ||
| 2nd (2nd leg) | 1. FC Köln | - | Eskişehirspor | 2:0 (1:0) | ||
| 1st(1st leg): 19/09/1973 15:00 | 2nd (2nd leg): 03/10/1973 19:00 | Winner: 1. FC Köln | ||||
| 1st(1st leg) | Ferencvárosi TC | - | Gwardia Warszawa | 0:1 (0:1) | ||
| 2nd (2nd leg) | Gwardia Warszawa | - | Ferencvárosi TC | 2:1 (2:0) | ||
| 1st(1st leg): 19/09/1973 15:15 | 2nd (2nd leg): 03/10/1973 18:15 | Winner: Gwardia Warszawa | ||||
| 1st(1st leg) | FC Carl Zeiss Jena | - | MP Mikkeli | 3:0 (2:0) | ||
| 2nd (2nd leg) | MP Mikkeli | - | FC Carl Zeiss Jena | 0:3 (0:2) | ||
| 1st(1st leg): 19/09/1973 17:00 | 2nd (2nd leg): 03/10/1973 17:00 | Winner: FC Carl Zeiss Jena | ||||
| 1st(1st leg) | Ruch Chorzów | - | Wuppertaler SV | 4:1 (1:0) | ||
| 2nd (2nd leg) | Wuppertaler SV | - | Ruch Chorzów | 5:4 (2:3) | ||
| 1st(1st leg): 19/09/1973 17:00 | 2nd (2nd leg): 03/10/1973 17:00 | Winner: Ruch Chorzów | ||||
| 1st(1st leg) | Admira/Wacker | - | Inter | 1:0 (1:0) | ||
| 2nd (2nd leg) | Inter | - | Admira/Wacker | 2:1 (0:0, 1:0) aet | ||
| 1st(1st leg): 19/09/1973 18:00 | 2nd (2nd leg): 03/10/1973 20:00 | Winner: Admira/Wacker | ||||
| 1st(1st leg) | B 1903 København | - | AIK Solna | 2:1 (2:1) | ||
| 2nd (2nd leg) | AIK Solna | - | B 1903 København | 1:1 (0:0) | ||
| 1st(1st leg): 19/09/1973 18:00 | 2nd (2nd leg): 03/10/1973 18:00 | Winner: B 1903 København | ||||
| 1st(1st leg) | Fenerbahçe | - | Argeș Pitești | 5:1 (1:1) | ||
| 2nd (2nd leg) | Argeș Pitești | - | Fenerbahçe | 1:1 (1:1) | ||
| 1st(1st leg): 19/09/1973 18:00 | 2nd (2nd leg): 03/10/1973 13:30 | Winner: Fenerbahçe | ||||
| 1st(1st leg) | Fredrikstad FK | - | Dinamo Kiev | 0:1 (0:1) | ||
| 2nd (2nd leg) | Dinamo Kiev | - | Fredrikstad FK | 4:0 (2:0) | ||
| 1st(1st leg): 19/09/1973 18:00 | 2nd (2nd leg): 03/10/1973 17:00 | Winner: Dinamo Kiev | ||||
| 1st(1st leg) | Strømsgodset IF | - | Leeds United | 1:1 (1:1) | ||
| 2nd (2nd leg) | Leeds United | - | Strømsgodset IF | 6:1 (3:1) | ||
| 1st(1st leg): 19/09/1973 18:00 | 2nd (2nd leg): 03/10/1973 19:30 | Winner: Leeds United | ||||
| 1st(1st leg) | Östers IF | - | Feyenoord | 1:3 (1:0) | ||
| 2nd (2nd leg) | Feyenoord | - | Östers IF | 2:1 (1:0) | ||
| 1st(1st leg): 19/09/1973 18:15 | 2nd (2nd leg): 03/10/1973 19:30 | Winner: Feyenoord | ||||
| 1st(1st leg) | Fortuna Düsseldorf | - | Næstved IF | 1:0 (0:0) | ||
| 2nd (2nd leg) | Næstved IF | - | Fortuna Düsseldorf | 2:2 (0:1) | ||
| 1st(1st leg): 19/09/1973 18:30 | 2nd (2nd leg): 03/10/1973 18:30 | Winner: Fortuna Düsseldorf | ||||
| 1st(1st leg) | Grasshopper Club Zürich | - | Tottenham Hotspur | 1:5 (1:2) | ||
| 2nd (2nd leg) | Tottenham Hotspur | - | Grasshopper Club Zürich | 4:1 (0:1) | ||
| 1st(1st leg): 19/09/1973 19:15 | 2nd (2nd leg): 03/10/1973 19:30 | Winner: Tottenham Hotspur | ||||
| 1st(1st leg) | Aberdeen FC | - | Finn Harps | 4:1 (3:0) | ||
| 2nd (2nd leg) | Finn Harps | - | Aberdeen FC | 1:3 (0:2) | ||
| 1st(1st leg): 19/09/1973 19:30 | 2nd (2nd leg): 03/10/1973 17:00 | Winner: Aberdeen FC | ||||
| 1st(1st leg) | Dundee FC | - | FC Twente '65 | 1:3 (0:1) | ||
| 2nd (2nd leg) | FC Twente '65 | - | Dundee FC | 4:2 (2:1) | ||
| 1st(1st leg): 19/09/1973 19:30 | 2nd (2nd leg): 03/10/1973 19:00 | Winner: FC Twente '65 | ||||
| 1st(1st leg) | Hibernian FC | - | ÍB Keflavík | 2:0 (1:0) | ||
| 2nd (2nd leg) | ÍB Keflavík | - | Hibernian FC | 1:1 (1:0) | ||
| 1st(1st leg): 19/09/1973 19:30 | 2nd (2nd leg): 03/10/1973 18:15 | Winner: Hibernian FC | ||||
| 1st(1st leg) | Ipswich Town | - | Real Madrid | 1:0 (0:0) | ||
| 2nd (2nd leg) | Real Madrid | - | Ipswich Town | 0:0 (0:0) | ||
| 1st(1st leg): 19/09/1973 19:30 | 2nd (2nd leg): 03/10/1973 20:00 | Winner: Ipswich Town | ||||
| 1st(1st leg) | OGC Nice | - | FC Barcelona | 3:0 (1:0) | ||
| 2nd (2nd leg) | FC Barcelona | - | OGC Nice | 2:0 (1:0) | ||
| 1st(1st leg): 19/09/1973 19:30 | 2nd (2nd leg): 03/10/1973 19:45 | Winner: OGC Nice | ||||
| 1st(1st leg) | ACF Fiorentina | - | FC Universitatea Craiova | 0:0 (0:0) | ||
| 2nd (2nd leg) | FC Universitatea Craiova | - | ACF Fiorentina | 1:0 (0:0) | ||
| 1st(1st leg): 19/09/1973 20:00 | 2nd (2nd leg): 03/10/1973 13:30 | Winner: FC Universitatea Craiova | ||||
| 1st(1st leg) | Torino FC | - | 1. FC Lokomotive Leipzig | 1:2 (0:0) | ||
| 2nd (2nd leg) | 1. FC Lokomotive Leipzig | - | Torino FC | 2:1 (2:0) | ||
| 1st(1st leg): 19/09/1973 20:00 | 2nd (2nd leg): 03/10/1973 17:00 | Winner: 1. FC Lokomotive Leipzig | ||||
| 1st(1st leg) | Lazio Roma | - | FC Sion | 3:0 (3:0) | ||
| 2nd (2nd leg) | FC Sion | - | Lazio Roma | 3:1 (1:1) | ||
| 1st(1st leg): 19/09/1973 20:15 | 2nd (2nd leg): 03/10/1973 19:15 | Winner: Lazio Roma | ||||
| 1st(1st leg) | Espanyol Barcelona | - | RWD Molenbeek | 0:3 (0:2) | ||
| 2nd (2nd leg) | RWD Molenbeek | - | Espanyol Barcelona | 1:2 (1:1) | ||
| 1st(1st leg): 19/09/1973 20:30 | 2nd (2nd leg): 03/10/1973 19:00 | Winner: RWD Molenbeek | ||||
| 1st(1st leg) | Panachaiki GE | - | Grazer AK | 2:1 (2:1) | ||
| 2nd (2nd leg) | Grazer AK | - | Panachaiki GE | 0:1 (0:0) | ||
| 1st(1st leg): 20/09/1973 18:30 | 2nd (2nd leg): 03/10/1973 18:30 | Winner: Panachaiki GE | ||||
| 1st(1st leg) | Os Belenenses | - | Wolverhampton Wanderers | 0:2 (0:1) | ||
| 2nd (2nd leg) | Wolverhampton Wanderers | - | Os Belenenses | 2:1 (1:1) | ||
| 1st(1st leg): 26/09/1973 21:30 | 2nd (2nd leg): 03/10/1973 19:30 | Winner: Wolverhampton Wanderers | ||||
