Ronaldinho was a wild-card (overage) member if Brazil's bronze medal-winning team at the 2008 Olympic Games but struggled in Brazil's last two World Cup qualifiers.
Earlier this month, Ronaldinho missed a penalty kick in a 3-0 win at Chile and was booed when he was substituted in a goalless tie at home to Bolivia.
"Ronaldinho has not had enough time to improve with his new club," said Dunga. "He is missing rhythm. I have confidence in him, as do all Brazilians, and I hope he can become again the Ronaldinho that all the world knows."
Brazil meets Venezuela Oct. 12 then Colombia four days later.
GOALKEEPERS: Julio Cesar (Inter Milan/ITA), Doni (AS Roma/ITA)
DEFENDERS: Maicon (Inter Milan/ITA), Daniel Alves (Barcelona/ESP), Lucio (Bayern Munich/GER), Juan (AS Roma/ITA), Thiago Silva (Fluminense), Alex (Chelsea/ENG), Kleber (Santos), Juan (Flamengo).
MIDFIELDERS: Gilberto Silva (Panathinaikos/GRE), Josue (Wolfsburg/GER), Lucas (Liverpool/ENG), Anderson (Manchester United/ENG), Elano (Manchester City/ENG), Kaka (AC Milan/ITA), Mancini (Inter Milan/ITA), Julio Baptista (AS Roma/ITA)
STRIKERS: Luis Fabiano (Sevilla/ESP), Jo (Manchester City/ENG), Pato (AC Milan/ITA), Robinho (Manchester City/ENG)