The Brazil coach says he will only bring 18 or 19 players with him to Johannesburg for March's Gillette Brasil Global Tour clash
The 65-year-old announced on Tuesday the names of the 16 European-based players who will make the trip next month.
And Felipao confirmed that he doesn't plan to use all 23 slots available to him for the trip.
"This friendly against South Africa is a different situation. It's no use me taking 23 players," he told a press conference.
"18 or 19 is the most I'll be taking. I'm always watching the players who are in action."
Manchester City midfielder Fernandinho and Bayern Munich full-back Rafinha have made the squad for the first time since Scolari succeeded former coach Mano Menezes at the Brazil helm, and he admits he will be watching those who have made the squad very closely in the coming weeks.
"I always call the players best suited," he said.
"I'll test some more players and then define the final list.
"I am watching those who will train well and work hard. There may still be a surprise when I make final call-ups."
The names of the domestic-based players who will complete the squad will be announced at the end of February.