Athletic Bilbao have confirmed that midfielder Iker Muniain has ruptured the anterior cruciate ligament in his right knee.
The 24-year-old suffered the injury during Thursday's Europa League defeat to Zorya Luhansk.
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Muniain spent more than eight months on the sidelines in 2015 after damaging ligaments in his left knee.
In a statement on their website, Athletic Bilbao said that Muniain will now see a specialist to determine how long he will be out for.
