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| 1st(1st leg) | FC Basel 1893 | - | Fram Reykjavík | 5:0 (2:0) | ||
| 2nd (2nd leg) | FC Basel 1893 | - | Fram Reykjavík | 6:2 (3:0) | ||
| 1st(1st leg): 18/09/1973 19:00 | 2nd (2nd leg): 20/09/1973 | Winner: FC Basel 1893 | ||||
| 1st(1st leg) | CSKA Sofia | - | SSW Innsbruck | 3:0 (3:0) | ||
| 2nd (2nd leg) | SSW Innsbruck | - | CSKA Sofia | 0:1 (0:1) | ||
| 1st(1st leg): 19/09/1973 | 2nd (2nd leg): 03/10/1973 | Winner: CSKA Sofia | ||||
| 1st(1st leg) | Crusaders FC | - | Dinamo Bucureşti | 0:1 (0:1) | ||
| 2nd (2nd leg) | Dinamo Bucureşti | - | Crusaders FC | 11:0 (4:0) | ||
| 1st(1st leg): 19/09/1973 | 2nd (2nd leg): 03/10/1973 | Winner: Dinamo Bucureşti | ||||
| 1st(1st leg) | TPS Turku | - | Celtic FC | 1:6 (1:2) | ||
| 2nd (2nd leg) | Celtic FC | - | TPS Turku | 3:0 (2:0) | ||
| 1st(1st leg): 19/09/1973 17:00 | 2nd (2nd leg): 03/10/1973 19:45 | Winner: Celtic FC | ||||
| 1st(1st leg) | Waterford AFC | - | Újpesti Dózsa SC | 2:3 (1:1) | ||
| 2nd (2nd leg) | Újpesti Dózsa SC | - | Waterford AFC | 3:0 (1:0) | ||
| 1st(1st leg): 19/09/1973 17:45 | 2nd (2nd leg): 03/10/1973 17:00 | Winner: Újpesti Dózsa SC | ||||
| 1st(1st leg) | Crvena Zvezda | - | FKS Stal Mielec | 2:1 (1:0) | ||
| 2nd (2nd leg) | FKS Stal Mielec | - | Crvena Zvezda | 0:1 (0:1) | ||
| 1st(1st leg): 19/09/1973 18:00 | 2nd (2nd leg): 03/10/1973 16:00 | Winner: Crvena Zvezda | ||||
| 1st(1st leg) | Viking FK | - | TJ Spartak TAZ Trnava | 1:2 (0:2) | ||
| 2nd (2nd leg) | TJ Spartak TAZ Trnava | - | Viking FK | 1:0 (1:0) | ||
| 1st(1st leg): 19/09/1973 18:00 | 2nd (2nd leg): 03/10/1973 14:00 | Winner: TJ Spartak TAZ Trnava | ||||
| 1st(1st leg) | Zorya Voroshilovgrad | - | APOEL Nikosia | 2:0 (2:0) | ||
| 2nd (2nd leg) | APOEL Nikosia | - | Zorya Voroshilovgrad | 0:1 (0:0) | ||
| 1st(1st leg): 19/09/1973 18:00 | 2nd (2nd leg): 03/10/1973 | Winner: Zorya Voroshilovgrad | ||||
| 1st(1st leg) | Jeunesse Esch | - | Liverpool FC | 1:1 (0:1) | ||
| 2nd (2nd leg) | Liverpool FC | - | Jeunesse Esch | 2:0 (0:0) | ||
| 1st(1st leg): 19/09/1973 18:30 | 2nd (2nd leg): 03/10/1973 19:30 | Winner: Liverpool FC | ||||
| 1st(1st leg) | Vejle BK | - | FC Nantes | 2:2 (2:1) | ||
| 2nd (2nd leg) | FC Nantes | - | Vejle BK | 0:1 (0:0) | ||
| 1st(1st leg): 19/09/1973 18:30 | 2nd (2nd leg): 03/10/1973 19:30 | Winner: Vejle BK | ||||
| 1st(1st leg) | Bayern München | - | Åtvidabergs FF | 3:1 (1:0) | ||
| 2nd (2nd leg) | Åtvidabergs FF | - | Bayern München | 3:4 (2:0, 3:1, 3:1) pso | ||
| 1st(1st leg): 19/09/1973 19:00 | 2nd (2nd leg): 03/10/1973 18:30 | Winner: Bayern München | ||||
| 1st(1st leg) | Dynamo Dresden | - | Juventus | 2:0 (2:0) | ||
| 2nd (2nd leg) | Juventus | - | Dynamo Dresden | 3:2 (3:1) | ||
| 1st(1st leg): 19/09/1973 19:00 | 2nd (2nd leg): 03/10/1973 20:00 | Winner: Dynamo Dresden | ||||
| 1st(1st leg) | Club Brugge KV | - | Floriana FC | 8:0 (5:0) | ||
| 2nd (2nd leg) | Floriana FC | - | Club Brugge KV | 0:2 (0:0) | ||
| 1st(1st leg): 19/09/1973 19:00 | 2nd (2nd leg): 03/10/1973 14:30 | Winner: Club Brugge KV | ||||
| 1st(1st leg) | Atlético Madrid | - | Galatasaray | 0:0 (0:0) | ||
| 2nd (2nd leg) | Galatasaray | - | Atlético Madrid | 0:1 (0:0, 0:0) aet | ||
| 1st(1st leg): 19/09/1973 20:00 | 2nd (2nd leg): 03/10/1973 19:00 | Winner: Atlético Madrid | ||||
| 1st(1st leg) | SL Benfica | - | Olympiakos Piraeus | 1:0 (0:0) | ||
| 2nd (2nd leg) | Olympiakos Piraeus | - | SL Benfica | 0:1 (0:1) | ||
| 1st(1st leg): 19/09/1973 21:45 | 2nd (2nd leg): 03/10/1973 18:30 | Winner: SL Benfica | ||||
