San José won European Championships with Spain at under-19 and under-21 level. He made his senior international debut in 2014, and was a member of the squad at the UEFA Euro 2016 tournament.
In August 2007, Premier League club Liverpool confirmed that the 18-year-old San José had joined on a three-year contract for a fee reported as €400,000.[5] He believed he had a greater chance of top-flight football via Liverpool's reserves than by accepting what he saw as an unconvincing offer of bypassing Athletic's third team to play for their B team in the Segunda División B.[6] Over the next two seasons, he played regularly for Liverpool Reserves,[7] and helped them win the 2007–08 Premier Reserve League title.[8] He frequently trained with the first team,[6] but the closest he came to playing for them was in February 2008 as an unused substitute against Chelsea.[4]
Athletic return
In August 2009, San José returned to Athletic Bilbao on a season-long loan to gain more first-team experience.[9] He was given the number 12 shirt, and made his debut on 17 September 2009 in a 3–0 group stage home win against FK Austria Wien in the 2009–10 UEFA Europa League.[10][11] It was reported in early November 2009 that he was frustrated by the lack of first-team opportunities, and that if this did not improve he would look to shorten the loan agreement and move either back to Liverpool or on loan to another club in January 2010;[12] he finally made his La Liga debut on the 8th, playing the last two minutes of the 2–0 away win over Racing de Santander,[13] and finished the campaign with 30 overall appearances, netting three times.[14][15][16]
In September 2019, San José reached the milestone of ten years with the same club.[10] On 24 November, he celebrated his 300th appearance in the Spanish top division in a 2–1 away victory against CA Osasuna, breaking a 31–game undefeated streak of the hosts at their El Sadar Stadium.[28]
In July 2020, Athletic confirmed that San José's contract would not be extended beyond that summer, although the departure was delayed beyond its usual June expiry after the season was postponed due to the COVID-19 pandemic in Spain. His contribution (along with long-serving colleague Beñat Etxebarria, also leaving in similar circumstances)[29] was acknowledged at the last home fixture on 16 July 2020 in an empty San Mamés[30] – he was in the matchday squad but did not leave the bench,[31] with his last appearance four months earlier in the Spanish Cup semi-finals;[32][33] His team won that tie, but the circumstances of the delay and the end of his spell at the club meant he would have no opportunity to take part in the final.
Birmingham City
On 21 September 2020, San José signed a two-year deal with English Championship club Birmingham City, whose head coach was fellow Basque Aitor Karanka.[34] He made his first-team debut, on 20 October away to Norwich City, in unfortunate circumstances: midfielder Adam Clayton was sent off after 86 goalless minutes, but before there was a stoppage in play to allow San José to come on, Norwich scored the winning goal.[35][36] He made what the Birmingham Mail dubbed an authoritative full debut playing in central midfield, looking "assured on the ball, intelligent off it",[37] and away to Preston North End a week later he "looked even more accomplished" in the centre of a back three before moving into midfield from where he crossed the ball for Gary Gardner's winning goal.[38] As matches – and poor results – became more frequent, San José's level of performance dropped, he appeared to tire, mistakes appeared, and he lost his place in the matchday squad.[39][40][41] Under new head coach Lee Bowyer, he seemed back to his best in a second-half cameo away to Derby County as Birmingham avoided relegation,[42] but on 28 May, his contract was terminated by mutual consent at his own request.[43]
Amorebieta
On 8 July 2021, San José returned to Spain, signing a one-year deal with the newly promoted Segunda División club SD Amorebieta.[44] He played 27 games as they were relegated, plus one in the cup, scoring once on 2 April to open a 3–1 home win over UD Ibiza.[45] He announced his retirement from professional football on 14 August 2022.[46]
On 29 August 2014, San José was named by full side manager Vicente del Bosque in a 23-man squad for matches against France and Macedonia in September.[48] He made his debut on 4 September, featuring the full 90 minutes in a 0–1 friendly loss to the former,[49] and was subsequently selected for the UEFA Euro 2016 tournament alongside Athletic teammate Aritz Aduriz.[50]
^Zaballa, Carlos (3 March 2020). "¿La hora de San José en el Athletic?" [San José's time at Athletic?]. Mundo Deportivo (in Spanish). Retrieved 28 July 2020.