New Brazil coach Dunga, who is known as a disciplinarian, will be without injured scrupulous defender David Luiz when his Brazil side faces Ecuador.
The Paris St. Germain defender injured his left knee in the 1-0 win over Colombia on Friday, and Brazil have called up 20-year-old full back Fabinho for Tuesday's friendly against Ecuador, the Brazilian Football Confederation said on Sunday.
Fabinho expressed his delight about the honour to play for his country's national team.
"It took me by surprise, it's incredible, my first call up for the full national team," said the Monaco player, who was with the Under-21 squad when he got the news.
"I was playing video games with the other lads and when they told me, no one could believe it."
The Brazil - Ecuador encounter will take place at the Metlife stadium in New Jersey on Tuesday.