The Real Madrid midfielder collected his third caution of the FIFA World Cup™ - after two in the 3-1 group win over Cote d'Ivoire - for a trip on Arturo Vidal during his country's 3-0 second-round win over Chile last night. It took some of the gloss off his return from suspension in a match that saw the five-time champions march into the quarter-finals thanks to goals from Juan, Luis Fabiano and Robinho.
Dunga said: "It is a problem - I don't want Kaka to be out suspended. It looks as though the technical players are punished and those who commit fouls aren't always. This started happening in the group phase and we are going to talk about this with Kaka. It is a concern for him but we don't want to get bogged down with the issue."
Ominously, though, Dunga warned that confidence among his squad was increasing with every match. He continued: "We know there is always this expectation that Brazil will be the winners but being the favourite does not allow you to win the World Cup.
"Some people doubted that we would perform but as we go along that confidence is growing and growing and we hope to make it to the final. When we had the ball, we were able to use it quickly. The quality Brazilian players have makes that easier. This team now has an ingrained playing style, even if there are personnel changes."
But the coach was slightly wary of their next challenge against the Netherlands. He added: "Holland have a great World Cup tradition and they are very similar to the South American teams so we have to be extremely careful. We have to be prepared to deal with extremely technical, excellent players. They are a solid team."
Opposite number Marcelo Bielsa felt his team deserved what they got, but was satisfied by what they had achieved in South Africa. We deserved to reach this stage but we also deserved to go out," he said.
"Perhaps the margin of victory was a bit excessive but, overall, it was clear just how superior our opponents were. Brazil had the patience to take advantage of any spaces we gave them, and it's always dangerous when you concede the first goal against them. We did a good job despite being one of the youngest sides in the competition, which makes me think that, with the benefit of more experience, we can continue to progress in the future."