|Full name||Igor Arnáez Martín|
|Date of birth||30 April 1991|
|Place of birth||Bilbao, Spain|
|Height||1.73 m (5 ft 8 in)|
|Playing position||Left back|
|2011–2012||→ Sestao (loan)||20||(0)|
|2012–2013||→ Amorebieta (loan)||29||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 17:38, 10 November 2019 (UTC)|
Born in Bilbao, Biscay, Basque Country, Arnáez graduated with Danok Bat CF's youth setup, after a short stint with Athletic Bilbao. He made his debuts as a senior with SD Lemona in the 2010–11 campaign, in Segunda División B.
In July 2011 Arnáez returned to Athletic, being assigned to the reserves also in the third level. However, after appearing sparingly, he was loaned to fellow league teams Sestao River Club and SD Amorebieta, respectively.
On 26 May 2014 Arnáez was released by the Lions, and moved to Segunda División's CD Tenerife on 27 August. He played his first match as a professional on 9 September, starting and playing the full 90 minutes in a 0–0 away draw against Girona FC for the season's Copa del Rey.
- 'Cuco' Ziganda quiere imprimir en el filial el estilo 'comprometido' de Bielsa ('Cuco' Ziganda wants to print Bielsa's 'committed' style in the reserves); El Mundo, 11 July 2011 (in Spanish)
- Igor Arnáez, ceded to Sestao River; Athletic's official website, 7 December 2011
- Cesión de Igor Arnaez (Loan of Igor Arnaez); Athletic's official website, 17 August 2012 (in Spanish)
- Registrations and de-registrations in Bilbao Athletic; Athletic's official website, 26 May 2014
- Igor Arnáez, nuevo jugador del CD Tenerife (Igor Arnáez, new player of CD Tenerife) Archived 2014-09-12 at the Wayback Machine; Tenerife's official website, 27 August 2014 (in Spanish)
- El Girona accede a tercera ronda ganando al Tenerife en los penaltis (Girona goes through the third round by defeating Tenerife on penalties); Marca, 9 September 2014 (in Spanish)