Brazil coach Dunga plans to speak to Kaka over the coming days in a bid to help the playmaker stop picking up needless yellow cards.
The Real Madrid midfielder collected his third caution of the World Cup - after two in the 3-1 group win over Ivory Coast - for a trip on Arturo Vidal during his country's 3-0 second-round win over Chile on Monday night.
Dunga said: "It is a problem - I don't want Kaka to be out suspended. This started happening in the group phase and we are going to talk about this with Kaka. "
He added: "It looks as though the technical players are punished and those who commit fouls aren't always."
The booking 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.
Ominously, 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."