Brazil only need a draw against bottom of the group Cameroon to make it to the next round of the World Cup but the players admit they know the game will be tough.
The hosts currently sit joint top of the their group with Mexico on four points with Croatia just behind them on three points.
Brazil will progress to the knock out stages if they get a draw against Cameroon but the squad will want more than that as a win would almost guarantee them the top spot in the group, which could be very important when determining who they play in the round of 16.
Cameroon have failed to win a game so far this tournament, losing to Mexico in their opening game then going down 4-0 to Croatia.
The players will be playing for pride against Brazil and this could cause an upset to the home fans as a Brazilian loss could see them go out of the competition. Other results would also have to go against them but who knows what might happen in this World Cup.
David Luiz admits playing Cameroon will be a challenge as they have nothing to lose and beating the hosts would be a major achievement.
Luiz said, according to WBAL: "We will be facing a team that comes without any responsibility.
"Their players will want to show that they can do better than they did in the first two matches. A victory against the hosts would be like a title to them."
"Cameroon will be playing for pride. Their players are still representing their nation and they will want to leave the World Cup by beating the hosts. We know that we will be facing a team that still wants to play well."
Cameroon will hope to be the team that knocks Brazil out of the World Cup, joining themselves, England and defending champions Spain.
Brazil go into the game with four players on yellow cards including Neymar which means another booking would rule them out of their round of 16 match. They could face either Holland or Chile.
Cameroon will be without Alex Song after he was red carded against Croatia and they will be relying on Samuel Eto'o to score their first goal of the competition.
With this most probably being his last World Cup Brazil have the right to feel worried as he will want to go out with a bang.
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