1st(1st leg) Dinamo Tbilisi - Athletic Club 2:1 (2:0)
2nd (2nd leg) Athletic Club - Dinamo Tbilisi 1:0 (0:0)
1st(1st leg): 12/08/1998 16:00 2nd (2nd leg): 26/08/1998 19:30 Winner: Athletic Club
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