The Brazilian club had all but assured themselves a place in next month’s final after winning last week’s first leg 3-0.

They completed their 3-0 aggregate victory after a gritty defensive performance at the Estadio Monumental.

River dominated possession and had 35 shots to Atletico’s five.

But the Argentines were unable to find a way through some dogged defending from Atletico who are all but guaranteed to face Brazilian rivals Botafogo in the final.

Botafogo lead Uruguayan team Penarol 5-0 after their semifinal leg and can clinch their berth in the final in Wednesday’s return fixture.