UEFA have approved the launch of a Nations League from 2018, with the new tournament to be played every second year.
Argentina's stars failed to find a way through a resilient Romania outfit in a surprising goalless draw in Bucharest.
Argentina striker Gonzalo Higuain believes Wednesday's friendly against Romania will provide a good test.
Greece will be favourites to secure a World Cup place as they head to Romania with a comfortable lead.
Konstantinos Mitroglou's brace helped give Greece a 3-1 win over Romania in their World Cup play-off tie in Piraeus.
Romania striker Razvan Cocis believes his team-mates have what it takes to breach Greece's defence.
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