Alex Sandro has been called up to the Brazil squad for next month's World Cup qualifiers in place of the injured Marcelo.
"Alex Sandro was called up on Friday for the Brazilian national team's next two matches," the Brazilian Football Confederation (CBF) said in a statement.
"Real Madrid were very thoughtful and sent over medical reports of tests carried out on Marcelo. After analysing them, the need for a longer recovery period was clear, which prevents his participation in the next matches."
Brazil, who have already qualified for next year's finals in Russia, face Bolivia in La Paz on October 5 before hosting Chile five days later in Sao Paulo.