Argentina and Brazil got off to a miserable start to their World Cup qualifying campaign with defeat on Thursday.
Marcos Rojo has dropped out of the Argentina squad at the request of Manchester United manager Louis van Gaal.
Lionel Messi has posted a photo of his attempts to recover from a knee injury as soon as possible.
Argentina have kept their spot at the top of the FIFA world rankings, while Wales are now eighth - their highest-ever position.
Bastian Schweinsteiger, Sergio Aguero and others picked up injuries on international duty.
Barcelona star Lionel Messi is facing up to two months on the sidelines after suffering a knee injury against Las Palmas.