Muniain has signed a two-year contract extension with Athletic Bilbao, the Primera Division club announced on Monday.
The 22-year-old has put pen to paper on his new deal on which will see him now tied to the Basque outfit for another four seasons.
A statement from the club read: "Athletic Club and player Iker Muniain have signed a contract extension that will see the player remain with the club until June 30, 2019.
"His buy-out clause has been set at 45million euros."
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