Iñaki Astiz Ventura

A product of local CA Osasuna's youth system, Astiz was born in Pamplona, Navarre, and his earlier career was spent with their reserves where he met Jan Urban, a former club player who was their manager at the time. Thus, he was loaned for the 2007–08 season to Legia Warsaw (where Urban would work as coach) in the Ekstraklasa, becoming the first Spaniard ever to play in that competition. Astiz returned to Osasuna in June 2008, only to rejoin Legia immediately for five years despite still having a contract running. The former, however, retained the possibility to re-buy the player after the first two seasons. On 21 June 2015, Astiz signed a two-year deal with APOEL FC in the Cypriot First Division. He made his competitive debut on 14 July, in a 0–0 home draw against FK Vardar in the second qualifying round of the UEFA Champions League. He scored his first goal for his new team on 12 December 2016, the second in the 2–1 home win over Anorthosis Famagusta FC in the domestic league. On 15 August 2017, the 33-year-old Astiz returned to Legia Warsaw. He scored his only goal in the Champions League on 31 July 2018, the only in a victory at FC Spartak Trnava in the second qualifying round that amounted to nothing as his side had lost 2–0 in the first leg. In June 2020, he agreed to a one-year extension at the Stadion Wojska Polskiego. Astiz joined their reserve team in the III liga in July 2021. He retired shortly after, aged 38; over his two spells, he won four national…

Legia Warsaw

On 25 October 2021, Legia II head coach Marek Gołębiewski was promoted to first-team manager, and Astiz joined his staff as an assistant. After the former's dismissal, he kept his role under Aleksandar Vuković, Kosta Runjaić, Gonçalo Feio and Edward Iordănescu. On 31 October 2025, Astiz was appointed caretaker manager following Iordănescu's departure. Legia's form continued to drop after he took over, resulting in finishing the first half of the domestic league in the relegation zone and failing to advance to the knockout stage of the UEFA Conference League. In terms of average points, he had the worst record (0.6 points per game) among all club managers who had been in charge for more than one match. On 18 December, they recorded their only win during his tenure, 4–1 over Lincoln Red Imps in the Conference League league phase; the following day, he was replaced by Marek Papszun and resumed his duties as an assistant.

AEK Larnaca

Astiz joined Mauro Camoranesi's staff at AEK Larnaca in June 2026. On 14 August, he was appointed caretaker manager after Camoranesi had left the club. He returned to his role as assistant on 25 August following Rubén Sellés' appointment, without managing AEK Larnaca in an official game.

Astiz met Polish blogger Dominika Fetraś in 2008 when he was playing in the country, and they married on 31 December 2014. He has a daughter, Luna.

Legia Warsaw

Ekstraklasa: 2012–13, 2013–14, 2017–18, 2019–20 Polish Cup: 2007–08, 2011–12, 2012–13, 2014–15, 2017–18 APOEL

Cypriot First Division: 2015–16, 2016–17