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| 1st(1st leg) | Dinamo Tbilisi | - | Athletic Bilbao | 2:1 (2:0) | ||
| 2nd (2nd leg) | Athletic Bilbao | - | Dinamo Tbilisi | 1:0 (0:0) | ||
| 1st(1st leg): 12/08/1998 16:00 | 2nd (2nd leg): 26/08/1998 19:30 | Winner: Athletic Bilbao | ||||
| 1st(1st leg) | Galatasaray | - | Grasshopper Club Zürich | 2:1 (0:0) | ||
| 2nd (2nd leg) | Grasshopper Club Zürich | - | Galatasaray | 2:3 (1:2) | ||
| 1st(1st leg): 12/08/1998 17:00 | 2nd (2nd leg): 26/08/1998 19:00 | Winner: Galatasaray | ||||
| 1st(1st leg) | HJK Helsinki | - | FC Metz | 1:0 (0:0) | ||
| 2nd (2nd leg) | FC Metz | - | HJK Helsinki | 1:1 (0:0) | ||
| 1st(1st leg): 12/08/1998 17:00 | 2nd (2nd leg): 26/08/1998 19:00 | Winner: HJK Helsinki | ||||
| 1st(1st leg) | Dinamo Kiev | - | AC Sparta Praha | 0:1 (0:1) | ||
| 2nd (2nd leg) | AC Sparta Praha | - | Dinamo Kiev | 1:3 (0:0, 0:1, 0:1) pso | ||
| 1st(1st leg): 12/08/1998 18:00 | 2nd (2nd leg): 26/08/1998 19:15 | Winner: Dinamo Kiev | ||||
| 1st(1st leg) | 1. FC Košice | - | Brøndby IF | 0:2 (0:0) | ||
| 2nd (2nd leg) | Brøndby IF | - | 1. FC Košice | 0:1 (0:1) | ||
| 1st(1st leg): 12/08/1998 18:00 | 2nd (2nd leg): 26/08/1998 19:10 | Winner: Brøndby IF | ||||
| 1st(1st leg) | AFC Steaua București | - | Panathinaikos | 2:2 (1:1) | ||
| 2nd (2nd leg) | Panathinaikos | - | AFC Steaua București | 6:3 (3:2) | ||
| 1st(1st leg): 12/08/1998 18:45 | 2nd (2nd leg): 26/08/1998 19:00 | Winner: Panathinaikos | ||||
| 1st(1st leg) | Rosenborg BK | - | Club Brugge KV | 2:0 (0:0) | ||
| 2nd (2nd leg) | Club Brugge KV | - | Rosenborg BK | 4:2 (1:1) | ||
| 1st(1st leg): 12/08/1998 19:15 | 2nd (2nd leg): 26/08/1998 19:15 | Winner: Rosenborg BK | ||||
| 1st(1st leg) | PFC Litex Lovech | - | Spartak Moskva | 0:5 (0:0) | ||
| 2nd (2nd leg) | Spartak Moskva | - | PFC Litex Lovech | 6:2 (3:1) | ||
| 1st(1st leg): 12/08/1998 19:15 | 2nd (2nd leg): 26/08/1998 16:00 | Winner: Spartak Moskva | ||||
| 1st(1st leg) | Maribor Teatanic | - | PSV Eindhoven | 2:1 (1:0) | ||
| 2nd (2nd leg) | PSV Eindhoven | - | Maribor Teatanic | 4:1 (1:1, 2:1, 4:1) aet | ||
| 1st(1st leg): 12/08/1998 19:15 | 2nd (2nd leg): 26/08/1998 19:00 | Winner: PSV Eindhoven | ||||
| 1st(1st leg) | Olympiakos Piraeus | - | Anorthosis Famagusta | 2:1 (2:0) | ||
| 2nd (2nd leg) | Anorthosis Famagusta | - | Olympiakos Piraeus | 2:4 (1:0) | ||
| 1st(1st leg): 12/08/1998 19:30 | 2nd (2nd leg): 26/08/1998 19:00 | Winner: Olympiakos Piraeus | ||||
| 1st(1st leg) | Bayern München | - | FK Obilić | 4:0 (0:0) | ||
| 2nd (2nd leg) | FK Obilić | - | Bayern München | 1:1 (0:0) | ||
| 1st(1st leg): 12/08/1998 19:30 | 2nd (2nd leg): 26/08/1998 19:30 | Winner: Bayern München | ||||
| 1st(1st leg) | Sturm Graz | - | Újpest FC | 4:0 (1:0) | ||
| 2nd (2nd leg) | Újpest FC | - | Sturm Graz | 2:3 (1:1) | ||
| 1st(1st leg): 12/08/1998 19:30 | 2nd (2nd leg): 26/08/1998 19:30 | Winner: Sturm Graz | ||||
| 1st(1st leg) | Manchester United | - | ŁKS Łódź | 2:0 (1:0) | ||
| 2nd (2nd leg) | ŁKS Łódź | - | Manchester United | 0:0 (0:0) | ||
| 1st(1st leg): 12/08/1998 19:45 | 2nd (2nd leg): 26/08/1998 20:05 | Winner: Manchester United | ||||
| 1st(1st leg) | Celtic FC | - | Croatia Zagreb | 1:0 (0:0) | ||
| 2nd (2nd leg) | Croatia Zagreb | - | Celtic FC | 3:0 (2:0) | ||
| 1st(1st leg): 12/08/1998 19:45 | 2nd (2nd leg): 26/08/1998 19:30 | Winner: Croatia Zagreb | ||||
| 1st(1st leg) | Inter | - | Skonto FC | 4:0 (3:0) | ||
| 2nd (2nd leg) | Skonto FC | - | Inter | 1:3 (1:1) | ||
| 1st(1st leg): 12/08/1998 19:45 | 2nd (2nd leg): 26/08/1998 19:00 | Winner: Inter | ||||
| 1st(1st leg) | SL Benfica | - | Beitar Jerusalem | 6:0 (2:0) | ||
| 2nd (2nd leg) | Beitar Jerusalem | - | SL Benfica | 4:2 (2:1) | ||
| 1st(1st leg): 12/08/1998 21:00 | 2nd (2nd leg): 26/08/1998 16:00 | Winner: SL Benfica | ||||
