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The club from Pamplona acquired seventeen-year-old defender Javier Martinez Aguinaga for six million euros, even though he has not yet played in any Spanish league matches.
The U-17 Spanish national team member signed a six-year contract with the Basque club and became the fourth purchase of the club this summer.
Former Spanish national team coach Javier Clemente has already strengthened his team with three new players: 27-year-old center-back Josu Sarriegi signed a three-year contract and arrived from Vitoria's "Alaves", left-back Alex Garcia returned to his hometown from Santander's "Racing", and 27-year-old winger Igor Gabilondo transferred from San Sebastian's "Real Sociedad" to Bilbao.