Mikel San Jose has renewed his contract with Athletic Bilbao, agreeing a deal to run until 2018.
The former Liverpool defender’s fresh terms include a release clause of €35m, according to AS.
San Jose, who turned 25 on May 30, began his career at San Mames before making the switch to Liverpool as a teenager.
He never got out of the Reds’ reserves and returned home in 2009, initially on loan, making the move permanent a year later.
San Jose, who has also been used in midfield, has made more than 100 appearances for Athletic.