The 65-year-old says there is still time for players to make a late push for a place in his squad but admits most places are already taken.
The Selecao face South Africa in Johannesburg on Wednesday as they continue their preparations for this summer's tournament, with a number of players pushing to press their case for a place.
Manchester City midfielder Fernandinho and Bayern Munich right back Rafinha are two surprise names in Scolari's latest squad and the 65-year-old - who lifted the world cup with Brazil in 2002 - admits he could still be persuaded to change his mind over who he takes to the competition.
"Remember the 2002 World Cup, I took players who almost never played with me," he told reporters at a pre-match press conference. "Ricardinho never played with me. Kaka was just in the last game. Whoever is playing has a chance. It is my first opportunity to work with Fernandinho and Rafinha and they should play the whole game, because the game serves more for that than for anything else.
"I have an almost closed group, I have to discern if someone appears different from everything that I have and could add more to my team, I have to look at him.
"This group of players, that is there, I have 95 percent of the Brazilian team here, maybe 90 percent."
Scolari then spoke about Brazil's star man, Neymar, and added that he expects nothing greater from the Barcelona man he has already displayed.
"I want Neymar playing the same way he has been playing. I want nothing more than what he has done, he is great," the manager said. "When he works with a quality coach like Tata Martino, it will add some virtues to him. I hope he continues the same way as he always played for Brazil."