Scolari's previous admission that he hopes to start the World Cup with the same 11 who recently drew with Portugal means Palmeiras shot-stopper Marcos is an almost certain inclusion.
Dida and Rogerio Ceni remain the most likely candidates for the other two places.
The pair came face to face earlier in the week when Dida's Corinthians beat Sao Paulo 2-0 away in the first leg of their Copa Brasil semi-final.
Former AC Milan keeper Dida stole a march on his rival by saving a penalty during that match.
Ceni, though, was left humiliated in the last minute when Corinthians striker Deivid nutmegged him for the second goal.
That mistake may give some hope to Flamengo custodian Julio Cesar.
But it is Cesar who remains the most likely of the four to suffer the cruellest of blows.