Brazil coach Luiz Felipe Scolari firmly believes his team is getting better with each World Cup game and hopes that will continue when they face Chile in the last 16.
The Canarinha demolished Cameroon 4-1 on Monday to finish top of Goup A and set up a meeting with the Chileans on Saturday in Belo Horizonte.
"We can improve a bit more and we will have to do so if we want to overcome Chile, who are good," Scolari said to newspaper Lacenet.
"Now we cannot make mistakes. From now on, everyone is on the same level."
Brazil had some nervous moments in their opener against Croatia before winning 3-1 and they drew their game against Mexico 0-0.
In Fortaleza, two first-half goals from Neymar put the hosts on the road to victory.
"I liked the way my team played," Scolari said. "We depend on Neymar just like Argentina depend on Lionel Messi.
"They are players that are very different and are the reference points in their respective national teams.
"The fact is that we have improved in our passing and our marking.
"We still need to put more pressure on midfield.
"Against Mexico, we didn't find the back of the net.
"Even though we scored four goals against Cameroon, we could have struck seven or eight times.
"We are nevertheless improving."
Scolari warned his players they now have to take their game to an extra level.
Chile, who finished second in Group B, won their opening two games against Australia and Spain but lost 2-0 to Holland on Monday.
Scolari is wary of Chile despite his national team having knocked them out the two times they have faced each other in the last 16 of the tournament.
"If I could have, I would have chosen a different rival," the 65-year-old said. "Chile, like all the South American sides, are very difficult.
"They have malice, they are organised and have a lot of quality."
The sides met in two friendlies recently - a 2-2 draw in Belo Horizonte in April and a 2-1 win for Brazil in Toronto last November.
"We played them twice and we already saw the challenges," Scolari said. "Many people thought Chile would be eliminated early on but no, they have quality.
"We will analyse their game and prepare in the best possible way."
Cameroon head home following a hugely disappointing tournament.
The African team lost all three of their games, conceding nine goals while finding the net just once.
"We have lacked concentration against a very good Brazilian side," Cameroon coach Volker Finke said to L'Equipe.
"It's not the first time that that has happened in the competition.
"We gave the ball away too easily in our own half and we were punished by a side that had plenty of goalscoring opportunities.
Finke, whose side had fallen 4-0 against Croatia in their previous encounter, says the team has to focus on the future.
"From now on, we must concentrate on the African Nations Cup in Morocco," he said.
"This is not the time to analyse our World Cup or African football.
"We need to be calm and give it some time."
Finke went on to reveal he has no intention of stepping down.
"I have a contract," he said. "I feel that I've done my job and this is essential.
"Cameroon had missed the last two African Nations Cup and we were happy to have qualified for the World Cup.
"We are of course disappointed not to have won a game in Brazil. That hurts.
"We've had setbacks with (captain) Samuel Eto'o unable to play (because of injury)."