Sabadell | 2010 Barcelona Open Banco Sabadell | Banco Sabadell | 2010 Barcelona Open Banco Sabadell – Doubles |
On 17 October 2012 Cruz made his official debut with Córdoba's first team, in a 1–0 away win against CE Sabadell FC, for the season's Copa del Rey.
The first son of Periko Alonso, who played with Real Sociedad and FC Barcelona, Alonso grew up surrounded by football: he and his younger brother, Xabi – who also appeared for Real Sociedad before representing with individual and team success Liverpool and Real Madrid – would go training with their father when he was playing for CE Sabadell FC; all three were midfielders.