Brazil's players were unhappy with the spectators who jeered coach Dunga and the team during the 0-0 World Cup qualifying draw with Argentina.
Frustrated by their side's performance, the 52,000 fans at the Mineirao stadium also applauded Argentina's Lionel Messi when he was substituted in stoppage-time.
"The Brazilian fans need to give encouragement," defensive midfielder Gilberto said. "But Argentina come to play in Brazil and the Brazilian supporters applaud Messi.
"I feel bad because I left my wife and two daughters at home and came here and did my best. Maybe I didn't play well and we didn't win but it's very bad to hear them booing the Brazil coach."