According to Real Madrid official announcement, Arda Guler and Militao suffer from muscle injury from bicept fermoris.
Real Madrid announcement:
After the tests carried out today on our players Arda Güler and Éder Militãoby the Real Madrid Medical Services, both have been diagnosed with a muscle injury in the biceps femoris. Güler's is on his right leg, while Éder's is on his left leg. Still waiting for further updates and information.
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Militao captain of injury