The 30-year-old striker has admitted that the Selecao are working hard to improve ahead of their opening match against Croatia on Thursday
Brazil will host the tournament in four days when they open up the competition against Croatia in Sao Paulo.
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Fred scored the only goal in Brazil’s nervy 1-0 friendly win over Serbia on Friday, which resulted in some fans booing the team’s performance.
However, Fred has acknowledged that while his team-mates have not yet reached their best technically or tactically, Brazil will be ready for the challenge that awaits them at the World Cup.
"We cannot deceive people and say that we are at 100 per cent. We are fine but we must evolve before our debut and then continue to improve throughout the competition," Fred told a press conference.
On his side’s preparations in Teresopolis, the Fluminense striker added: "They were two very good weeks for us because there were some errors and it is good that they happened because we have time to correct them.”
Brazil play Croatia in their opening Group A game in Sao Paulo on June 12 before facing Mexico and Cameroon.