Internacional were brushed aside by visiting Bahia in the opening leg of their second round clash last week, losing 2-0 at the Estadio Jose Pinheiro Borba.
Bahia had drawn three consecutive matches in Brazil's Serie A but returned to winning ways at the expense of high-flying Internacional, who sit second in the table, thanks to quick-fire goals form Lucas Fonseca and Diego Macedo in Belo Horizonte.
Marcio Araujo's Bahia now have two priceless away goals up their sleeve heading into Thursday's return leg on home soil, but Internacional coach Braga insisted the tie is far from over.
"We will not be discouraged. We will continue to work," Braga said of the 2008 champions.
"This team has been one of the leaders in the Brazilian Serie A. We need to regroup."
Fellow Brazilian powerhouse Sao Paulo - winners in 2012 - must also overturn a first-leg deficit on Thursday, though they are in relatively better shape as they return to familiar surroundings with an away goal.
Sao Paulo - minus the likes of Ganso, Kaka, Osvaldo and Luis Fabiano - were beaten 2-1 by Criciuma at the Estadio Heriberto, ending the club's three-match winning streak.
Speaking post-game, Sao Paulo coach Muricy Ramalho said: "We could have taken a draw here, was a very similar game. Overall, it was not a good match."
Gimnasia La Plata will enter the match on the back of a win in Argentina's Primera Division over the weekend, while Estudiantes were beaten.
On Thursday, Rosario Central are at home to struggling Boca Juniors - the competition's most successful team with two wins in 2004 and 2005.
