In the summer of 2006, Aimar joined fellow top flight club Real Zaragoza on a four-year deal for a reported fee of €11 million, with the club describing the deal as the most important signing in the club's history. At Zaragoza, he was reunited with compatriot and former Valencia teammate Roberto Ayala, who himself had joined the club earlier in the month. Aimar made his league debut on 27 August in a 2–3 away loss against Deportivo de La Coruña and went on to make 32 appearances across all competitions, scoring five goals and helping the club to a sixth-place finish in the league. The following season was a disastrous one for Aimar and Zaragoza as the club, fraught with poor performances and financial mismanagement were relegated from La Liga. Zaragoza's relegation saw Aimar bring an end to his time in Aragon, having made 57 appearances during his two-season stay with the club. During his stint with Zaragoza, he obtained dual-Spanish nationality, having lived in the country since 2001.