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 participated.
Qualified teams
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 |
Group 1Group 2Group 3Group 4Group 5
---- ''Colo-Colo won 3-0 on aggregate.'' Champion |
Argentina