Kaka is suspended for the game after being sent off in his team's 3-1 triumph over Ivory Coast.
The Canarinha lead Group G, two points clear of second-place Portugal, who need a win to guarantee the top spot in the pool.
"Brazil will go out to win," said Kaka. "This final group game is important for us to finish first. A draw would also be good but a win would give us the strength to go into the knock-out round really motivated."
Portugal thumped Korea DPR 7-0 in its last game to give themselves a far superior goal difference than Ivory Coast should both teams finish level on points.
Brazil has won 12 and lost twice against Portugal in 18 meetings between the two sides.
"There is a little bit of rivalry between Brazil and Portugal," said Kaka.
"There are three Brazilian-born players in their side (Pepe, Deco and Liedson).
"You never know what can happen," said the Real Madrid star.
"Portugal drew against Ivory Coast and Spain lost against Switzerland. Football is like that and at times you find adversity and you don't know how a game will develop."