The legendary hitman, who was overlooked by Brazil coach Carlos Dunga, is trying to follow events in South Africa, and he hopes to witness an all South American final on July 11.
"I never saw the Greece - Argentina match because I was training. Now Brazil and Argentina can only meet in the final," he said on Twitter.
"It would be an incredible thing."
Ronaldo won the World Cup in 1994 and 2002, and he is the all time highest goalscorer in the finals with 15 strikes, one more than German legend Gerd Muller.
Argentina clash with Mexico in the last 16 on Saturday night, whereas Brazil play their final group clash against Portugal on Friday. The Selecao need to avoid defeat to ensure they don't end up in Argentina's half of the draw.
Who has the best chance of winning the World Cup? Check out Castrol Football's 2010 FIFA World Cup Winner Predictor.
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