Brazil, who qualified with three matches to spare when they won 3-1 in Argentina last month, play eliminated Bolivia in La Paz on Sunday and are at home to Venezuela three days later.
"They are important matches for those who want to secure their places (in the team)," Luis Fabiano said at Brazil's Granja Comary training camp in Teresopolis.
"I also want to play because I want to be the top marksman of the qualifiers," he told reporters.
Luis Fabiano's two goals in the victory in Rosario took his tally to nine as leading scorer in the South American group.
Although Brazil have complained in the past about having to play in the rarefied atmosphere of La Paz, 3,600 metres above sea level, there has been no moaning from coach Dunga's squad.
Reserve striker Diego Tardelli said: "We're near the World Cup and I'm a new arrival (in the squad), I have to grab this chance. My dream is to get there (South Africa)".
Tardelli is the second highest scorer in the Brazilian championship with 14 goals, one less than Brazil team mate Adriano.
Another player who should get a chance to show Dunga his worth, in the absence of injured defenders Lucio and Juan, is Naldo of Werder Bremen.
Seventh-placed Venezuela, who host already-qualified Paraguay on Saturday, still have a slim chance of reaching the finals. The top four in the group go through automatically and Chile are almost there in third place.
Venezuela are two points behind fourth-placed Ecuador, one point short of Argentina, level with Uruguay, and one ahead of Colombia in a tight race for fourth spot and the fifth-place finish that earns a playoff aginst a CONCACAF team.
