Unai Bustinza

Leganés On 22 July 2015, Bustinza was loaned to Segunda División side CD Leganés in a season-long deal. The following 18 July, having contributed 1,134 minutes in all competitions to a top-flight promotion, he signed a permanent three-year contract after cutting ties with Athletic.

Bustinza scored the first of two goals in the Spanish top tier on 21 February 2018, but in a 1–3 home defeat to Real Madrid.

Málaga On 2 July 2022, free agent Bustinza joined second-tier Málaga CF on a three-year deal. On 30 June 2023, after suffering relegation, he activated a clause on his contract and left.

Amorebieta In November 2023, Bustinza started training with SD Amorebieta. On 18 January 2024, he agreed to a deal at the second-division team.

International career Bustinza made his debut for the unofficial Basque Country national team in May 2019, in a 0–0 draw away to Panama for which a small, youthful and inexperienced squad was selected.