Ronaldo has insisted that Brazil will meet Argentina in the World Cup final.
The Selecao legend has backed the South American rivals to play in the showpiece occasion on July 13, but admits that it would be a disaster if his country failed to win.
"I'm pretty sure that the final will be Brazil-Argentina," he told reporters. "It will be a dream if we win. But to lose would be a nightmare. So hopefully Argentina lose before then."
Ronaldo was part of the Brazil squad that won the World Cup in 2002.
