Kaka is still crucial to Brazil's hopes of a sixth World Cup crown, according to team-mate Robinho on Friday.

Robinho, who is on loan to Brazilian club Santos, outshone the Real Madrid star in the Selecao's opening Group G victory 2-1 over DPR Korea on Tuesday, even when dropping back into Kaka's role behind the strikers.

Kaka is still trying to recover full fitness following a season at Real Madrid disrupted by groin and thigh problems and was replaced by Nilmar in the 78th minute against the DPR Koreans.

But Robinho has no doubt that he remains an important figure for Brazil as they prepare for matches against both Portugal and Cote d'Ivoire next week.

"When Kaka plays well he can decide any game. He is very important to us," said Robinho.

"I realise that we can all improve in the coming games. It was only the first one and what happened was fairly normal. The Selecao has excellent players and if we have to replace anyone we are reassured by the quality we have."