Portugal slumped to an embarrassing 1-0 defeat at home to Albania in their opening Euro 2016 qualifier in Lisbon.
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.
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