- Gustavo forced to pull out due to personal reasons.
- Wolfsburg midfielder sixth player to withdraw from Selecao.
- Bayern's Costa another notable absentee.
After Kaka pulled out through injury earlier in the day, the Brazil Football Federation (CBF) announced on Thursday that Gustavo would be replaced by Gremio Foot-Ball Porto Alegrense's Walace in the squad.
FC Bayern München's Douglas Costa had to withdraw due to a thigh strain.
Dunga's men kick off their group-stage campaign against Ecuador on 4 June before facing minnows Haiti and then Peru.