The buyout clause in Nico Williams' new contract at Athletic Bilbao will come into effect next year.
Williams signed a new deal with Athletic this week to 2035, extending the original deal which was to run to 2027.
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The new arrangement includes a buyout clause of €100m - which comes into effect at the turn of the year in 2026.
Williams' salary also jumps to €10m plus bonuses, which involves Spain appearances and trophies won.
The winger's new deal has stunned many - including a section of the Athletic support - after a mural was defaced three times since the end of the season amid talk of him quitting the club for Barcelona.