# 1991 Copa Libertadores

The 1991 Copa Libertadores was won by Colo-Colo of Chile after defeating Olimpia of Paraguay with a 3–0 aggregate score in the finals. The championship would mark a first for a Chilean club team in an international tournament. Twenty-one clubs from all South American countries within Confederación Sudamericana de Fútbol (CONMEBOL) participated.

## Qualified teams

| Country | Team | Qualification method |
| CONMEBOL (1 berth) | Olimpia | 1990 Copa Libertadores champion |
| Argentina (2 berths) | River Plate | 1989–90 Primera División champion |
| Argentina (2 berths) | Boca Juniors | 1989–90 Liguilla Pre-Libertadores winner |
| Bolivia (2 berths) | Oriente Petrolero | 1990 Primera División champion |
| Bolivia (2 berths) | Bolívar | 1990 Primera División runner-up |
| Brazil (2 berths) | Corinthians | 1990 Campeonato Brasileiro Série A champion |
| Brazil (2 berths) | Flamengo | 1990 Copa do Brasil champion |
| Chile (2 berths) | Colo-Colo | 1990 Primera División champion |
| Chile (2 berths) | Deportes Concepción | 1990 Liguilla Pre-Libertadores winner |
| Colombia (2 berths) | América de Cali | 1990 Campeonato Profesional champion |
| Colombia (2 berths) | Atlético Nacional | 1990 Campeonato Profesional runner-up |
| Ecuador (2 berths) | LDU Quito | 1990 Campeonato Ecuatoriano champion |
| Ecuador (2 berths) | Barcelona | 1990 Campeonato Ecuatoriano runner-up |
| Paraguay (2 berths) | Cerro Porteño | 1990 Primera División champion |
| Paraguay (2 berths) | Colegiales | 1991 Pre-Libertadores playoff winner |
| Peru (2 berths) | Universitario | 1990 Primera División champion |
| Peru (2 berths) | Sport Boys | 1990 Primera División runner-up |
| Uruguay (2 berths) | Nacional | 1990 Liguilla Pre-Libertadores winner |
| Uruguay (2 berths) | Bella Vista | 1990 Liguilla Pre-Libertadores runner-up |
| Venezuela (2 berths) | Marítimo | 1989–90 Primera División champion |
| Venezuela (2 berths) | Unión Atlético Táchira | 1989–90 Primera División runner-up |

## Draw

The champions and runners-up of each football association were drawn into the same group along with another football association's participating teams. Three clubs from Paraguay competed as Olimpia was champion of the 1990 Copa Libertadores. They entered the tournament in the Second round.
| Group 1 | Group 2 | Group 3 | Group 4 | Group 5 |
| Argentina  Bolivia | Chile  Ecuador | Brazil  Uruguay | Paraguay  Peru | Colombia  Venezuela |

## Group stage
### Group 1

Group 1 standings :
| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification | BOL | BOC | OPE | RIV |
| 1 | Bolívar | 6 | 3 | 1 | 2 | 9 | 5 | +4 | 7 | Round of 16 | — | 2–0 | 2–0 | 4–1 |
| 2 | Boca Juniors | 6 | 2 | 2 | 2 | 6 | 6 | 0 | 6 | Round of 16 | 0–0 | — | 0–0 | 4–3 |
| 3 | Oriente Petrolero | 6 | 2 | 2 | 2 | 5 | 7 | −2 | 6 | Round of 16 | 2–1 | 1–0 | — | 1–1 |
| 4 | River Plate | 6 | 2 | 1 | 3 | 10 | 12 | −2 | 5 | | 2–0 | 0–2 | 3–1 | — |

### Group 2

Group 2 standings :
| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification | CC | LDQ | CON | BSC |
| 1 | Colo-Colo | 6 | 3 | 3 | 0 | 10 | 3 | +7 | 9 | Round of 16 | — | 3–0 | 2–0 | 3–1 |
| 2 | LDU Quito | 6 | 2 | 2 | 2 | 5 | 6 | −1 | 6 | Round of 16 | 0–0 | — | 4–0 | 0–0 |
| 3 | Deportes Concepción | 6 | 2 | 2 | 2 | 6 | 8 | −2 | 6 | Round of 16 | 0–0 | 3–0 | — | 1–0 |
| 4 | Barcelona | 6 | 0 | 3 | 3 | 5 | 9 | −4 | 3 | | 2–2 | 0–1 | 2–2 | — |

### Group 3

Group 3 standings :
| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification | FLA | COR | NAC | BVI |
| 1 | Flamengo | 6 | 3 | 3 | 0 | 11 | 4 | +7 | 9 | Round of 16 | — | 1–1 | 4–0 | 1–1 |
| 2 | Corinthians | 6 | 1 | 4 | 1 | 7 | 6 | +1 | 6 | Round of 16 | 0–2 | — | 0–0 | 4–1 |
| 3 | Nacional | 6 | 2 | 2 | 2 | 7 | 6 | +1 | 6 | Round of 16 | 0–1 | 1–1 | — | 3–0 |
| 4 | Bella Vista | 6 | 0 | 3 | 3 | 5 | 14 | −9 | 3 | | 2–2 | 1–1 | 0–3 | — |

### Group 4

Group 4 standings :
| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification | COL | CCP | UNI | SBA |
| 1 | Colegiales | 6 | 2 | 4 | 0 | 10 | 5 | +5 | 8 | Round of 16 | — | 1–1 | 2–0 | 4–1 |
| 2 | Cerro Porteño | 6 | 2 | 4 | 0 | 9 | 4 | +5 | 8 | Round of 16 | 1–1 | — | 0–0 | 3–0 |
| 3 | Universitario | 6 | 1 | 3 | 2 | 4 | 6 | −2 | 5 | Round of 16 | 0–0 | 1–1 | — | 1–3 |
| 4 | Sport Boys | 6 | 1 | 1 | 4 | 7 | 15 | −8 | 3 | | 2–2 | 1–3 | 0–2 | — |

### Group 5

Group 5 standings :
| Pos | Team | Pld | W | D | L | GF | GA | GD | Pts | Qualification | AME | NAC | TAC | MAR |
| 1 | América de Cali | 6 | 5 | 1 | 0 | 10 | 3 | +7 | 11 | Round of 16 | — | 1–0 | 3–2 | 2–0 |
| 2 | Atlético Nacional | 6 | 2 | 2 | 2 | 7 | 7 | 0 | 6 | Round of 16 | 0–2 | — | 0–0 | 2–2 |
| 3 | Unión Atlético Táchira | 6 | 1 | 3 | 2 | 6 | 7 | −1 | 5 | Round of 16 | 1–1 | 1–2 | — | 2–1 |
| 4 | Marítimo | 6 | 0 | 2 | 4 | 4 | 10 | −6 | 2 | | 0–1 | 1–3 | 0–0 | — |
* Colombian club teams América, and Atlético Nacional were unable to play at their home venues. Their games were held in Miami, Florida and San Cristóbal, Venezuela.

## Round of 16

* The top three teams in every group qualified along with Olimpia the champion of Copa Libertadores 1990
* First leg matches were played on April 16 and April 17, 1991. Second leg matches were played on April 24 and April 25, 1991.
| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
| Nacional | 5–2 | Bolívar | 4–1 | 1–1 |
| Universitario | 1–2 | Colo-Colo | 0–0 | 1–2 |
| Deportivo Táchira | 2–8 | Flamengo | 2–3 | 0–5 |
| Boca Juniors | 4–2 | Corinthians | 3–1 | 1–1 |
| Deportes Concepción | 3–6 | América de Cali | 0–3 | 3–3 |
| LDU Quito | 2–4 | Atlético Nacional | 2–2 | 0–2 |
| Olimpia | 3–2 | Colegiales | 1–1 | 2–1 |
| Oriente Petrolero | 1–3 | Cerro Porteño | 1–1 | 0–2 |

## Quarterfinals

* First leg matches were played on May 1, May 2, and May 3, 1991. Second leg matches played on May 8 and May 10, 1991.
| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
| Colo-Colo | 4–2 | Nacional | 4–0 | 0–2 |
| Flamengo | 2–4 | Boca Juniors | 2–1 | 0–3 |
| América de Cali | 0–2 | Atlético Nacional | 0–0 | 0–2 |
| Cerro Porteño | 1–3 | Olimpia | 1–0 | 0–3 |

## Semifinals

* First leg matches played on May 16, 1991. Second leg matches played on May 22 and May 23, 1991.
| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
| Boca Juniors | 2–3 | Colo-Colo | 1–0 | 1–3 |
| Atlético Nacional | 0–1 | Olimpia | 0–0 | 0–1 |

## Finals

First leg match played on May 29, 1991, in Asunción, Paraguay at Defensores del Chaco stadium. Second leg final match played on June 5, 1991, in Santiago, Chile at Estadio Monumental David Arellano.
Colo-Colo won 3-0 on aggregate.

## Champion

* Copa Libertadores 1991 winners
* Colo-Colo 1st title