Spain playmaker Isco said the 2010 world champions are now facing "the moment of truth" after scraping a 2-2 draw with Morocco to secure a World Cup last-16 date with Russia.
Isco scored in yesterday's dramatic stalemate here to earn the man-of-the-match award and his country top place in Group B, on goals scored, from Portugal. Portugal face Uruguay in the next round.
"It's going to be a tough game, we're playing the hosts, the entire country will be behind them. They play excellent football," said Isco.
"We played a friendly against them before the World Cup, we can't make any mistakes."
"I have complete faith in this team."