The players were forced to sit out of training on Sunday leaving coach Dunga concerned he may have to make yet more changes to his injury-plagued squad.
Brazil is sweating on the fitness of Kaka and Fabinho ahead of the team's Copa America opener against Ecuador on Sunday.
Coach Dunga has already lost four of his original 23-man squad, with Ricardo Oliveira, Douglas Costa, Rafinha and Ederson all having dropped out through injury.
Orlando City midfielder Kaka and Monaco right back Fabinho both made substitute appearances in the Chevrolet Brasil Global Tour victory over Panama on Sunday, but sat out of Tuesday’s training session following the team’s return to Los Angeles.