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| 1st(1st leg) | Flamengo RJ | - | Boca Juniors | 2:1 (0:0) | ||
| 2nd (2nd leg) | Boca Juniors | - | Flamengo RJ | 3:0 (2:0) | ||
| 1st(1st leg): 01/05/1991 | 2nd (2nd leg): 08/05/1991 | Winner: Boca Juniors | ||||
| 1st(1st leg) | Cerro Porteño | - | Club Olimpia | 1:0 (0:0) | ||
| 2nd (2nd leg) | Club Olimpia | - | Cerro Porteño | 3:0 (1:0) | ||
| 1st(1st leg): 02/05/1991 | 2nd (2nd leg): 08/05/1991 | Winner: Club Olimpia | ||||
| 1st(1st leg) | Colo-Colo | - | Nacional | 4:0 (2:0) | ||
| 2nd (2nd leg) | Nacional | - | Colo-Colo | 2:0 (1:0) | ||
| 1st(1st leg): 03/05/1991 | 2nd (2nd leg): 08/05/1991 | Winner: Colo-Colo | ||||
| 1st(1st leg) | América de Cali | - | Atlético Nacional | 0:0 (0:0) | ||
| 2nd (2nd leg) | Atlético Nacional | - | América de Cali | 2:0 (2:0) | ||
| 1st(1st leg): 03/05/1991 | 2nd (2nd leg): 10/05/1991 | Winner: Atlético Nacional | ||||
