|Full name||Aritz Elustondo Irribarria|
|Date of birth||28 March 1994|
|Place of birth||San Sebastián, Spain|
|Height||1.78 m (5 ft 10 in)|
|2012–2015||Real Sociedad B||59||(6)|
|2012–2013||→ Beasain (loan)||29||(0)|
* Senior club appearances and goals counted for the domestic league only and correct as of 4 April 2019|
‡ National team caps and goals correct as of 12 October 2018
Born in San Sebastián, Gipuzkoa, Basque Country, Elustondo graduated from Real Sociedad's youth system. On 13 July 2012, he was loaned to Tercera División club SD Beasain, and made his senior debut for the latter.
On 14 January 2015, Elustondo made his first-team debut, starting in a 2–2 home draw against Villarreal CF for the season's Copa del Rey. He first appeared in La Liga three days later, in a 0–1 home loss to Rayo Vallecano.
Elustondo scored his first professional goal on 31 January 2015, but in a 1–4 defeat at Real Madrid. On 3 January of the following year, after being regularly used by new manager Eusebio Sacristán, he signed a new contract with the Txuri-urdin until 2020.
- "Zuhaitz Gurrutxagak eta Aritz Elustondok Beasainen jokatuko dute aurten" [Zuhaitz Gurrutxaga and Aritz Elustondo will play in Beasain this year] (in Basque). Beasain. 13 July 2012. Archived from the original on 15 January 2015. Retrieved 15 January 2015.
- "Aritz Elustondo renueva hasta 2016" [Aritz Elustondo renews until 2016] (in Spanish). Real Sociedad. 31 January 2014. Retrieved 15 January 2015.
- "El Villarreal no pierde el control" [Villarreal do not lose control]. Marca (in Spanish). 14 January 2015. Retrieved 15 January 2015.
- "Manucho castiga a Moyes" [Manucho punishes Moyes]. Marca (in Spanish). 17 January 2015. Retrieved 17 January 2015.
- "Real Madrid smash David Moyes' Real Sociedad". ESPN FC. 31 January 2015. Retrieved 2 February 2015.
- "El canterano Aritz Elustondo renueva hasta 2020" [Youth graduate Aritz Elustondo renews until 2020]. Diario AS (in Spanish). 5 January 2016. Retrieved 6 January 2016.