 He finished the campaign with three goals in 29 appearances, although Zamudio finished bottom of the table and were relegated.On 5 April 2017, Larrazabal agreed to a two-year contract with Athletic Bilbao, effective as of 1 July; upon arriving, he was assigned to the B-team.He spent two seasons with Bilbao Athletic in the third tier, playing regularly for the team and scoring nine goals in 2018–19.