Scolari split his 23-man squad into two teams a number of times over the weekend for practice games with the 65-year-old coach seemingly selecting a first XI against a second XI.
But after Sunday's training session in Teresopolis, Scolari indicated he may have to rethink his preferred starting side ahead of the FIFA World Cup.
"I did not like the training, I did not like anything, all wrong," Scolari told Globo TV.
"When I do not like something I have to find a solution, put it on the field, until I'm satisfied."
"Thiago is recuperating...we have two friendly games before the World Cup and it is preferable that he gets better," Scolari told Fox Sports.
Hernanes played alongside Luis Gustavo in Sunday's practice game and could start in midfield versus Panama.
