Brazil hosts Mexico on Sunday in Sao Paulo as both teams gear up for the Copa America, which kicks off next week.
Robinho could miss Brazil's international friendly against Mexico because of an injury and there are doubts about his fitness approaching the Copa America.
The Santos forward pulled out of training Wednesday with a right knee problem, while he sat out Thursday's session as he underwent MRI scans.
The Brazilian Football Confederation (CBF) released a statement saying the 30-year-old will continue to receive treatment ahead of Sunday's friendly at Allianz Parque in Sao Paulo.
Should Robinho fail to prove his fitness, the veteran will join Diego Alves, Marcelo, Luiz Gustavo and Oscar on the sidelines for South America's showpiece event, where Brazil will come up against Peru, Colombia and Venezuela in Group C.