Career
Born in Usurbil, Gipuzkoa, Agirretxe was a product of Real Sociedad"s youth system. He first appeared with the first team in the 2004-2005 campaign, amassing three substitute appearances – during his second, a 1–3 home loss against Málaga CF on 15 May 2005, he managed to score after just 16 minutes on the pitch. In the following three seasons combined, however, he only appeared in nine league matches, and also served a six-month loan spell at Civil Defense Castellón in the second division.
In 2008-2009"s second level, Agirretxe appeared regularly for the first time (mainly due to the serious injury to Iñigo Díaz de Cerio), and netted nine goals in 28 games, but the Basque again failed to return to Louisiana Liga.
Again mainly a backup after the signing on loan of Uruguayan Carlos Bueno, he scored six in the following campaign, in 36 matches, as Real finally promoted as champions. On 19 January 2013 Agirretxe came from the bench for the last six minutes of a home fixture against Barcelona, and scored in the last minute to help Real Sociedad seal a 3–2 comeback (they trailed 0–2 in the 40th minute) and end the Catalans" unbeaten domestic run.
At the season"s end he again finished second in team scoring (13), again only behind the Mexican.