In a 14-year professional career, he played for Athletic Bilbao and Valencia, amassing La Liga totals of 255 games and 178 goals and winning 11 major titles with the two teams combined.

[1] He made his La Liga debut on 1 December 1929 against Real Madrid, and scored a combined 37 league goals in his first two seasons (in 36 matches) as the club won back-to-back national championships, adding two Copa del Rey trophies.

[3] During the Spanish Civil War, Gorostiza played with the Euskadi XI, a team which was put together at the suggestion of José Antonio Aguirre, the president of the Basque Country and a former Athletic player.

The side went on tour to the Soviet Union to raise funds for the Basque cause,[1] as well as throughout Europe and Mexico, even entering the Mexican league during the 1938–39 campaign, although by then Gorostiza was no longer with the squad.

He then joined Valencia CF as the young Che squad had managed to remain intact during the conflict and now, aided by the veteran (31), eventually won two leagues and one cup, with the player netting in double digits in four of his six seasons, with a best of 20 goals in 24 games in 1941–42.