|Full name||José Ignacio Sáez Ruiz|
|Date of birth||23 April 1943|
|Place of birth||Bilbao, Spain|
|Height||1.70 m (5 ft 7 in)|
|1974–1978||Athletic Bilbao (youth)|
|* Senior club appearances and goals counted for the domestic league only|
The vast majority of his professional career was spent with Athletic Bilbao, which he later also coached in various levels, appearing in more than 300 official games with his main club.
Born in Bilbao, Basque Country, Sáez joined local giants Athletic Bilbao in 1962, from neighbouring Barakaldo CF. He totalled 46 La Liga games – with five goals – in his first two seasons combined, but appeared in only 20 in the following three combined, due to injuries.
Again healthy, Sáez appeared regularly for Athletic from 1967–74, helping the Lions to two Copa del Rey trophies, and retired at the age of 31, having appeared in nearly 350 official games for the club. He was part of a legendary defense that also featured José Ángel Iribar in goal, Luis María Echeberría and Jesús Aranguren.
Sáez earned three caps for Spain in one month in 1968, his first and his last appearance being against the same opponent, England, in two losses for the UEFA Euro 1968 qualifying stage (0–1 in London, 1–2 in Madrid).
Aged only 32, Sáez began a managerial career, taking charge of Athletic Bilbao's youth sides for five years. Only two games into the 1980–81 season, Austrian Helmut Senekowitsch was fired, and he led the team to a final ninth position, and returned again to the B-team, helping it to a Segunda División return in 1983.
Sáez again took the reins of the first team in 1985–86, replacing Javier Clemente for the final 13 games of the season, and leading Athletic to the third place, behind Real Madrid and FC Barcelona. In the following four seasons, he coached the reserves in the second level, being again promoted to the first team midway through 1990–91, again replacing Clemente, and being himself fired after round 23 of the following campaign, as the team only finished two points above the relegation zone.
After two spells with UD Las Palmas, both in division three, Sáez was appointed at Albacete Balompié in the top flight, replacing fired Benito Floro in mid-March 1996, his first game in charge being a 0–2 away loss against Real Madrid as the season finished in relegation through the playoffs.
In the summer of 1996, Sáez was appointed the Spanish under-21 team manager, winning the UEFA European Championship two years later after defeating Greece. Also being in charge of the under-20s, he led them to the FIFA World Cup of the category in 1999, in Nigeria.
In 2002, Sáez was named José Antonio Camacho's successor at the helm of the senior team, being in charge until the end of Euro 2004 – which ended in group stage exit – and collecting 15 wins, six draws and two losses in his 23 games in charge.
Subsequently, Sáez returned to the under-21 team, retiring from the football world in 2008 at the age of 65.
- Segunda División B: 1982–83, 1988–89
- 'Txutxi' Aranguren, un defensa total ('Txutxi' Aranguren, a complete defender); El País, 22 March 2011 (in Spanish)
- Adiós a Helmut Senekowitsch (Goodbye to Helmut Senekowitsch); Mundo Deportivo, 10 September 2007 (in Spanish)
- El Athletic, con tantas dificultades como hace 23 años (Athletic, struggling just like 23 years ago); Mundo Deportivo, 12 November 2014 (in Spanish)
- "1998: Iván Pérez applies finishing touch". UEFA. Retrieved 10 July 2018.
- España no pasa del empate ante Zambia (Spain can only draw against Zambia); El Mundo, 8 April 1999 (in Spanish)
- "Qué fue de los campeones del mundo sub20" [What happened to the under-20 world champions] (in Spanish). Marca. 17 April 2009. Retrieved 3 May 2017.
- Saez seeks Spanish success; BBC Sport, 24 May 2004
- "Sáez selects Spain squad". UEFA. 20 May 2004. Retrieved 7 May 2016.
- Saez ends reign in Spain; BBC Sport, 25 June 2004
- Empate de España sub-21 en el retorno de Iñaki Sáez (Spanish under-21s draw in return of Iñaki Sáez); Diario AS, 17 August 2004 (in Spanish)
- "España vence a Alemania y se proclama campeona de Europa Sub-19" [Spain beat Germany and are crowned Under-19 European champions] (in Spanish). Diario AS. 28 July 2002. Retrieved 6 September 2018.