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| 1st(1st leg) | Debreceni VSC | - | Hansa Rostock | 1:1 (0:0) | ||
| 2nd (2nd leg) | Hansa Rostock | - | Debreceni VSC | 1:2 (0:0) | ||
| 1st(1st leg): 18/07/1998 | 2nd (2nd leg): 25/07/1998 | Winner: Debreceni VSC | ||||
| 1st(1st leg) | AJ Auxerre | - | Espanyol Barcelona | 1:1 (0:0) | ||
| 2nd (2nd leg) | Espanyol Barcelona | - | AJ Auxerre | 1:0 (0:0) | ||
| 1st(1st leg): 18/07/1998 | 2nd (2nd leg): 25/07/1998 | Winner: Espanyol Barcelona | ||||
| 1st(1st leg) | Ruch Chorzów | - | Estrela Amadora | 1:1 (0:0) | ||
| 2nd (2nd leg) | Estrela Amadora | - | Ruch Chorzów | 2:4 (0:0, 1:1, 1:1) pso | ||
| 1st(1st leg): 18/07/1998 | 2nd (2nd leg): 25/07/1998 | Winner: Ruch Chorzów | ||||
| 1st(1st leg) | Valencia CF | - | Shinnik Yaroslavl | 4:1 (2:0) | ||
| 2nd (2nd leg) | Shinnik Yaroslavl | - | Valencia CF | 1:0 (1:0) | ||
| 1st(1st leg): 18/07/1998 | 2nd (2nd leg): 25/07/1998 | Winner: Valencia CF | ||||
| 1st(1st leg) | Fortuna Sittard | - | Vorskla Poltava | 3:0 (0:0) | ||
| 2nd (2nd leg) | Vorskla Poltava | - | Fortuna Sittard | 2:2 (0:0) | ||
| 1st(1st leg): 18/07/1998 | 2nd (2nd leg): 25/07/1998 | Winner: Fortuna Sittard | ||||
| 1st(1st leg) | Bologna FC | - | National Bucureşti | 2:0 (2:0) | ||
| 2nd (2nd leg) | National Bucureşti | - | Bologna FC | 3:1 (2:1) | ||
| 1st(1st leg): 18/07/1998 | 2nd (2nd leg): 25/07/1998 | Winner: Bologna FC | ||||
| 1st(1st leg) | SC Bastia | - | Altay Izmir | 2:0 (1:0) | ||
| 2nd (2nd leg) | Altay Izmir | - | SC Bastia | 3:2 (0:0, 2:0) aet | ||
| 1st(1st leg): 18/07/1998 | 2nd (2nd leg): 25/07/1998 | Winner: SC Bastia | ||||
| 1st(1st leg) | Lommelse SK | - | Werder Bremen | 1:3 (1:0) | ||
| 2nd (2nd leg) | Werder Bremen | - | Lommelse SK | 2:1 (1:0) | ||
| 1st(1st leg): 18/07/1998 | 2nd (2nd leg): 25/07/1998 | Winner: Werder Bremen | ||||
| 1st(1st leg) | FC Twente | - | SV Austria Salzburg | 2:2 (1:1) | ||
| 2nd (2nd leg) | SV Austria Salzburg | - | FC Twente | 3:1 (2:0) | ||
| 1st(1st leg): 18/07/1998 | 2nd (2nd leg): 25/07/1998 | Winner: SV Austria Salzburg | ||||
| 1st(1st leg) | Vojvodina | - | Baltika Kaliningrad | 4:1 (1:0) | ||
| 2nd (2nd leg) | Baltika Kaliningrad | - | Vojvodina | 1:0 (0:0) | ||
| 1st(1st leg): 18/07/1998 | 2nd (2nd leg): 25/07/1998 | Winner: Vojvodina | ||||
| 1st(1st leg) | KRC Harelbeke | - | Sampdoria | 0:1 (0:0) | ||
| 2nd (2nd leg) | Sampdoria | - | KRC Harelbeke | 3:0 (2:0) | ||
| 1st(1st leg): 19/07/1998 | 2nd (2nd leg): 25/07/1998 | Winner: Sampdoria | ||||
| 1st(1st leg) | Crystal Palace | - | Samsunspor | 0:2 (0:1) | ||
| 2nd (2nd leg) | Samsunspor | - | Crystal Palace | 2:0 (1:0) | ||
| 1st(1st leg): 19/07/1998 | 2nd (2nd leg): 25/07/1998 | Winner: Samsunspor | ||||
