Dunga picked 35-year-old Ricardo Oliveira over Alexandre Pato, but has explained the reason why he chose to do so.
Pato has been one of the standout stars of the Brazilian season so far after rediscovering the form that saw him move to Europe in 2007.
Dunga opted to pick Oliveira over Pato after Firmino picked up an injury and has explained the reason, is due to the different style both forwards operate in.
“Ricardo Oliveira is the top-scorer of the Brazilian league,” Dunga told UOL.
“He scores from the right, from the left, from inside and outside the box, at home and away.
“He plays in the [centre-forward] position we need, but Pato plays on the wing where we already have Douglas Costa.
“You know when I first picked Douglas Costa they said he was not good enough. But he became good once he went to Bayern Munich.”
Dunga went on to question Pato’s emotional strength after the 26-year-old publically vented his frustrations at not being called up for the matches against Chile and Venezuela.
“Everyone has a second chance to improve,” Dunga said.
“We’re talking about the emotional issue. He moaned because he was not called up, and then he was no longer able to produce the same level of form that day,” he added, referencing Pato’s underwhelming showing in a goalless draw against Chapecoense the evening the Brazil squad was announced.