The Selecao face Venezuela in Santiago on Sunday and must win to guarantee a place in the quarter-finals and are facing the prospect of doing so without their talisman and captain.
The Barcelona star's headbutt on Colombia's Jeison Murillo and alleged misbehaviour towards Chilean official Enrique Osses in the tunnel following the Group C encounter on Wednesday night earned him a stiff punishment from Conmebol, meaning Brazil's quest for a first Copa America since 2007 has been made all the more difficult.
Despite Neymar's absence, Dunga was reluctant to condemn his skipper's actions, instead placing the blame for his sending off on the tactics of the Colombian players who agitated him.
"Neymar is a huge figure in football," he said. "The attention on him is big also. Everybody who likes football wants to see him on the field - like Lionel Messi, Angel Di Maria and Alexis Sanchez. With him, the spectacle would be better, with more quality.
"If each one of us who made a mistake was cut, no-one would be here. We're here to make them grow, not to search for guilty ones."
Brazil opened their Copa America campaign with a 2-1 win over Peru before coming unstuck against Colombia at the Estadio Monumental. As group favourites, the 2014 World Cup hosts were expected to have qualified by now but Dunga insists hope is not lost within the camp
"Everybody's desire was to advance after two games, but football isn't theory, it's practical," he said. "I'll go in the positive direction: we have the team and conditions to advance.
"We will suffer not just in this game, but also in the others. We have to be mature to know that when things are not going right, we can change. It isn't all finished because we lost a game. We just need to find a balance."
Dunga also stated that an appeal is likely to be made against Neymar's ban.
"We'll leave this to the Brazilian Football Federation (CBF)," he said. "They will present arguments on the measures taken against Neymar. We do not want anything in our favour. Let there be equal judgments for everybody in the competition. Only that.
"Our concern is on the game tomorrow and we want to make the best job possible, and also find solutions for the team."
On the question of whether or not the 23-year-old planned to remain with the squad for the remainder of the tournament in the event of the appeal failing, Dunga said: "The decision is up to the player. We treat them like men who have to make decisions. We have to think if it will be positive if he stays here. We don't know if it will help or not ... if it will transmit sadness. We do not want boys here, only men. They represent Brazil all across the world. They make the decisions."
He also confirmed that no decision has yet been taken on who will replace Neymar as captain. "We'll try some options to see what works for our team. Tomorrow I'll make a decision. You'll know the captain ahead of the game."