Striker Jong Tae-se warned Brazil not to expect an easy start to the World Cup when they face North Korea next Tuesday.
Dunga's side are bidding for a sixth world title in South Africa and are widely expected to take all three points in their Group G opener at Ellis Park in Johannesburg.
With the attacking flair of Kaka and Robinho coupled with the defensive strength of Champions League winners Lucio and Maicon, it will certainly be no easy task for North Korea.
But Jong believes the East Asians are capable of overcoming the odds and claiming a shock victory.
"North Korea is a mystery, and nobody knows about North Korea," said the Kawasaki Frontale forward.
"We are brave and we can win against Brazil. Everybody thinks it is game we cannot win but we have a brave heart and brave spirits."