The hosts face their South American rivals in Belo Horizonte on Saturday with a place in the quarter-finals on offer for the winners, and Hernanes concedes that there can no longer be any mistakes from Luiz Felipe Scolari's side.
"Chile will be another difficult game. At this stage every game is a final," the Inter Milan midfielder told Goal.com. "You can no longer afford to make any mistakes. If you lose, your tournament is over.
"Chile have been in fine form and they have an amazing team. They have some superb players. It will be a real test for Brazil to show again what we can do."
Brazil finished top of Group A after winning twice and drawing once in the opening stage.