Brazil star Neymar said his side have "turned it around" after their 7-1 defeat to Germany in the World Cup semifinals.
The tournament hosts were dismantled by the eventual winners in one of the most stunning matches in World Cup history.
Dunga replaced Luis Felipe Scolari as boss after the tournament, and his side -- who beat France 3-1 in Paris last week -- have now won all seven of his games.
They face South American rivals Chile in a prestige friendly at Arsenal's Emirates stadium on Sunday.
Didier Deschamps said he felt his France team could learn a number of lessons from their 3-1 defeat to Brazil in Thursday's friendly.
Deschamps saw his side beaten at the Stade de France after going in front through Raphael Varane's first-half goal.
Chelsea star Oscar equalised before Neymar and Luiz Gustavo struck in the second half to give Dunga's men victory and leave Deschamps to ponder where his team, who reached the World Cup quarterfinals, could improve.
"I'm not happy -- I didn't enjoy that....