Brazil coach Carlos Alberto Parreira insists he will keep faith with Ronaldo and his side's attacking style against Australia on Sunday.
The reigning champions were less than convincing despite a winning start to the defence of their trophy, and an unfit Ronaldo in particular was virtually static.
Parreira said: 'Ronaldo has not been playing for the last two months and has had only two friendlies so it was natural he felt a bit heavy as it was very hot, but I'm sure he will improve as the tournament goes on.
'Ronaldo will start against Australia because he needs to gain pace, and he is a decisive player.
'Australia are physically strong with three or four very good players from the European leagues - (Harry) Kewell, (Marco) Bresciano and (Tim) Cahill especially.
'Our business is to put the ball on the pitch and use our technical capabilities - we are not going to fight it out. That game is decisive for whoever wins it has qualified for the last 16 and that's our initial objective.'
Victory was achieved courtesy of a brilliant goal by Kaka but the South Americans only played well in flashes.
Kaka said: 'It was essential to win our first match but we all have to improve and that includes myself. We have to improve our movement, to be more creative and to mark better. I'm sure the next game will be better as we will not feel under so much pressure.'
Kaka admitted that 29-year-old Ronaldo's lack of mobility is something the Real Madrid player will need to change.
He added: 'Ronaldo has said he has not reached his ideal level of fitness so let's wait until he improves his performance and is the Ronaldo that we know and like, but yes a little more movement from him would be ideal.'
