The first leg was hosted by Olimpia at the Estadio Defensores del Chaco in Asunción, Paraguay on 3 October 1990, while the second leg was hosted by Barcelona at the Estadio Monumental in Guayaquil, Ecuador on 10 October 1990.

[1] Olimpia won the final 3–1 on aggregate for their second Copa Libertadores title.

However, as Olimpia also went on to win the Supercopa Libertadores, they were automatically awarded the Recopa Sudamericana title.

The team that accumulated the most points – two for a win, one for a draw, zero for a loss – after the two legs was crowned champion.

If the two teams had tied on points after the second leg, extra time would not be played, and a penalty shoot-out would be used to determine the winner.