Unai Simon has signed a new contract with Athletic Bilbao.
The new agreement extends through the summer of 2029, and does not contain a buyout clause.
The 26-year-old has so far made 194 appearances in Athletic Club's shirt.
The Spanish club are currently in fifth place in the La Liga table, with one round to play.
Simn was brought up in Athletic Club's academy operation and has never played for any other club at senior level.