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| H | Boca Juniors | - | Colo-Colo | 1:0 (1:0) | ||
| R | Colo-Colo | - | Boca Juniors | 3:1 (0:0) | ||
| H: 16.05.1991 | R: 22.05.1991 | Sieger: Colo-Colo | ||||
| H | Atlético Nacional | - | Club Olimpia | 0:0 (0:0) | ||
| R | Club Olimpia | - | Atlético Nacional | 1:0 (1:0) | ||
| H: 16.05.1991 | R: 23.05.1991 | Sieger: Club Olimpia | ||||
