Veteran striker Aritz Aduriz, 36, has signed a one-year contract extension that will see him stay at Athletic Bilbao until 2019, the La Liga club announced Wednesday.
The buyout clause for the 13-times capped Spain international remains 40 millon euros ($47.3m).
Aduriz has already scored nine goals this season, four in La Liga and five in the Europa League.
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"It can't be any other way, I'm very happy, very satisfied and very grateful to Athletic, who I consider almost my family," said Aduriz.