Although in no apparent danger of missing out on one of the South American Zone's four automatic slots at next year's world finals, A Seleção have only won four of their 11 preliminaries to date and have not been firing on all cylinders - as witnessed by Sunday's fortuitous draw in Ecuador. That result left Dunga's side a point behind both Argentina and Chile, and five adrift of group leaders Paraguay.
Having felt moved to excuse the lethargic showing of Ronaldinho, who gave way to goalscorer Julio Baptista in Quito, Dunga is clearly banking on Kaka raising the standard against group tailenders Peru in Porto Alegre.
The Brazil coach said yesterday that Kaka was "in a fit state to play" and suggested that Ronaldinho could well be benched for the match in his home city. Kaka "is fit, though I don't know how much of the game he will manage," Dunga told reporters.
The 26-year-old has been undergoing a special training programme with physios following the foot injury he suffered in Serie A in February, and he said he was feeling much better, if not 100 per cent.
"I would like to be able to play and after this latest training session I saw I was pretty much ready to play, but I don't know how long for," Kaka said, echoing Dunga's own assessment.
"I am much better and I am available for Dunga," he added following an energetic training session against youngsters from Brazilian side Gremio. "If I am in a fit state to do so, I'd like to get through the 90 minutes.
"I want to help all those who were with me in this exercise (of recuperating). After so many days without playing I have got back my fitness and now am ready to help the Brazilian team.