Argentina are only fourth in the regional group, five points behind the group-leading Brazilians, and only four teams go through automatically, hence Real Madrid forward Kaka says the nerves will get to Lionel Messi and company as they go all out for the win they need to catch up.
But he added it would be tough for both sides. "The game won't be easy for anyone - with a Brazil v Argentina match there will be a number of top talents out there with players capable of swinging the match at any moment.
Kaka said he wanted to play down his duel with Barcelona's Messi. "I would vote for him today (as world player of the year) for all that he won (last season) with Barcelona. I believe Messi is the big favourite to win the prize as FIFA's best player this year."