![BILBAO, SPAIN - OCTOBER 16: Real Sociedad Fans between Athletic Fans in the Match between Athletic Bilbao and Real Sociedad, Celeb Editorial Image - Image of bilbao, october: 87657130 BILBAO, SPAIN - OCTOBER 16: Real Sociedad Fans between Athletic Fans in the Match between Athletic Bilbao and Real Sociedad, Celeb Editorial Image - Image of bilbao, october: 87657130](https://thumbs.dreamstime.com/z/bilbao-spain-october-real-sociedad-fans-athletic-fans-match-athletic-bilbao-real-sociedad-celeb-87657130.jpg)
BILBAO, SPAIN - OCTOBER 16: Real Sociedad Fans between Athletic Fans in the Match between Athletic Bilbao and Real Sociedad, Celeb Editorial Image - Image of bilbao, october: 87657130
![Thousands of Athletic Bilbao fans greet their side in open-top bus parade following shock Spanish Super Cup victory over Barcelona | Daily Mail Online Thousands of Athletic Bilbao fans greet their side in open-top bus parade following shock Spanish Super Cup victory over Barcelona | Daily Mail Online](https://i.dailymail.co.uk/i/pix/2015/08/18/23/2B7A2D8400000578-0-image-a-41_1439936156776.jpg)
Thousands of Athletic Bilbao fans greet their side in open-top bus parade following shock Spanish Super Cup victory over Barcelona | Daily Mail Online
![Football Soccer - Athletic Bilbao v Rapid Wien - UEFA Europa League Group Stage - Group F - San Mames, Bilbao, Spain - 29/9/16. Athletic Bilbao fans sing before the match. REUTERS/Vincent West Stock Photo - Alamy Football Soccer - Athletic Bilbao v Rapid Wien - UEFA Europa League Group Stage - Group F - San Mames, Bilbao, Spain - 29/9/16. Athletic Bilbao fans sing before the match. REUTERS/Vincent West Stock Photo - Alamy](https://c8.alamy.com/comp/2CNM8BT/football-soccer-athletic-bilbao-v-rapid-wien-uefa-europa-league-group-stage-group-f-san-mames-bilbao-spain-29916-athletic-bilbao-fans-sing-before-the-match-reutersvincent-west-2CNM8BT.jpg)
Football Soccer - Athletic Bilbao v Rapid Wien - UEFA Europa League Group Stage - Group F - San Mames, Bilbao, Spain - 29/9/16. Athletic Bilbao fans sing before the match. REUTERS/Vincent West Stock Photo - Alamy
![BILBAO, SPAIN - OCTOBER 16: Fans of Athletic Club Bilbao in Action in the Match between Athletic Bilbao and Real Sociedad, Celebra Editorial Stock Photo - Image of player, official: 87657263 BILBAO, SPAIN - OCTOBER 16: Fans of Athletic Club Bilbao in Action in the Match between Athletic Bilbao and Real Sociedad, Celebra Editorial Stock Photo - Image of player, official: 87657263](https://thumbs.dreamstime.com/z/bilbao-spain-october-fans-athletic-club-bilbao-action-match-athletic-bilbao-real-sociedad-celebra-87657263.jpg)
BILBAO, SPAIN - OCTOBER 16: Fans of Athletic Club Bilbao in Action in the Match between Athletic Bilbao and Real Sociedad, Celebra Editorial Stock Photo - Image of player, official: 87657263
![How does Athletic Bilbao's academy manage to produce 85% of their team? | Athletic Bilbao | The Guardian How does Athletic Bilbao's academy manage to produce 85% of their team? | Athletic Bilbao | The Guardian](https://i.guim.co.uk/img/media/bbd79af40224f9d21eda320f0b1ba65139513a2c/0_0_4500_2700/master/4500.jpg?width=620&quality=85&fit=max&s=aaa950eb113ee74e27d2663914cc7470)
How does Athletic Bilbao's academy manage to produce 85% of their team? | Athletic Bilbao | The Guardian
![Athletic Bilbao fans in Madrid before Copa del Rey 2012 Final against FC Barcelona Stock Photo - Alamy Athletic Bilbao fans in Madrid before Copa del Rey 2012 Final against FC Barcelona Stock Photo - Alamy](https://c8.alamy.com/comp/CPMXTH/athletic-bilbao-fans-in-madrid-before-copa-del-rey-2012-final-against-CPMXTH.jpg)
Athletic Bilbao fans in Madrid before Copa del Rey 2012 Final against FC Barcelona Stock Photo - Alamy
![BILBAO, SPAIN - OCTOBER 16: Fans of Athletic Club Bilbao in Action in the Match between Athletic Bilbao and Real Sociedad, Celebra Editorial Stock Photo - Image of football, futbol: 87657993 BILBAO, SPAIN - OCTOBER 16: Fans of Athletic Club Bilbao in Action in the Match between Athletic Bilbao and Real Sociedad, Celebra Editorial Stock Photo - Image of football, futbol: 87657993](https://thumbs.dreamstime.com/b/bilbao-spain-october-fans-athletic-club-bilbao-action-match-athletic-bilbao-real-sociedad-celebra-87657993.jpg)
BILBAO, SPAIN - OCTOBER 16: Fans of Athletic Club Bilbao in Action in the Match between Athletic Bilbao and Real Sociedad, Celebra Editorial Stock Photo - Image of football, futbol: 87657993
![Squawka on Twitter: "Athletic Bilbao fans celebrate winning the Supercopa de España after beating Barcelona 5-1 on aggregate. Scenes. http://t.co/Eu9Td5XuOL" / Twitter Squawka on Twitter: "Athletic Bilbao fans celebrate winning the Supercopa de España after beating Barcelona 5-1 on aggregate. Scenes. http://t.co/Eu9Td5XuOL" / Twitter](https://pbs.twimg.com/media/CMtgdM2WEAAcKT1.jpg:large)
Squawka on Twitter: "Athletic Bilbao fans celebrate winning the Supercopa de España after beating Barcelona 5-1 on aggregate. Scenes. http://t.co/Eu9Td5XuOL" / Twitter
![Athletic Bilbao vs. Real Madrid: Spanish Football's 'Old Classic' Rivalry | News, Scores, Highlights, Stats, and Rumors | Bleacher Report Athletic Bilbao vs. Real Madrid: Spanish Football's 'Old Classic' Rivalry | News, Scores, Highlights, Stats, and Rumors | Bleacher Report](https://img.bleacherreport.net/img/article/media_slots/photos/002/834/918/b8e4c259bad44fd57ed092f15f083ca1_crop_exact.jpg?w=2975&h=2048&q=85)