Neymar helps Santos progress

Good timing ... Neymar (left) celebrates after scoring against Once Caldos (AAP)

Brazil forward Neymar scored the goal that saw Santos progress to the semi-finals of the Copa Libertadores after a 2-1 aggregate victory against Once Caldas.

The 19-year-old put his side ahead in the 12th minute before Wason Renteria levelled after half-an-hour and the Brazilian side held on to progress despite Neymar missing a late penalty.

Santos will now meet either Chiapas of Mexico or Paraguay's Cerro Porteno.

Velez Sarsfield also reached the last four after Maximiliano Moralez scored twice as the Argentinian side beat Libertad of Paraguay 4-2 on the night, 7-2 on aggregate.

It will now take on the winner of the quarter-final between Uruguay's Penarol and Chile's Universidad Catolica.

"This team have what it takes to clinch important goals," Moralez told Fox Sports.

"We must not go crazy and feel over-confident. We should think game by game.

"Our next rivals will be as difficult as the past ones and we have to be focused."