The Brazil international ruptured the biceps femoris tendon in his left leg during Madrid's 2-0 league defeat against Celta Vigo on Dec. 7 and could be sidelined until April 2026.
Using crutches, Militao, arrived in Rio de Janeiro on Thursday and told reporters: "No return date has been set. The priority is the World Cup.
"Doing things well so I can come back strong. [I'm] 100% confident."
"When fit, Militao, who played at the 2022 World Cup, has been a regular in Brazil's squads.
"Militao, 27, has struggled with serious injuries in recent seasons. In August 2023, he tore his left ACL and only returned to action in March 2024. Last season, he was sidelined for eight months after tearing his right ACL and damaging his meniscus.
"Carlo Ancelotti, who coached Militao at Madrid before taking over the Brazil national team in May, recently warned his players that only those that are "100 percent fit" will make Brazil's World Cup squad.
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Militao is expected to miss Brazil's international friendlies against France and Croatia in the March international window.
Five-time winners Brazil begin their World Cup campaign against Morocco on June 13 in New York. They face Haiti six days later in Philadelphia before their final Group C game against Scotland in Miami.
