Born in Madrid, Fernández joined Real Madrid's youth system from neighbouring RSD Alcalá, aged 12. In 2010, he started appearing with Real Madrid Castilla in Segunda División B and, in July of that year, he was called by first-team coach José Mourinho to a preseason tour in the United States.[2] He made his unofficial debut on 5 August in a friendly against Club América (3–2 win), with his brother Nacho also making his first appearance that day.[3]
Fernández made his league debut with the B side on 29 August 2010, playing 87 minutes in a 3–2 home win against Coruxo FC.[4] On 3 October he scored his first goal, contributing to the 3–0 home victory over AD Cerro de Reyes.[5] He finished his first season with 32 games and two goals, as the team fell short in the promotion playoffs.
Fernández left Real Madrid in August 2013, by mutual consent. He signed shortly after with RCD Espanyol in the top level,[8][9] appearing in 30 competitive matches in his first year but starting in only five.
On 31 August 2016, shortly after terminating his contract with the Pericos, due to expire the following year,[13] Fernández signed for Elche CF.[14] The following 7 August, after suffering relegation, he agreed to a two-year deal with fellow Segunda División team Cádiz CF.[15]
With a total of 11 goals, Fernández was his team's top scorer in 2019.[16] He scored 13 during the season from 41 appearances, in a return to the top flight as runners-up.[17]
In 2020–21, Fernández contributed four goals – bettered in the team only by Álvaro Negredo's eight – as the Andalusian side stayed up in 12th place; he missed the final two months with a right knee injury.[18] On 6 June 2022, he extended his contract until 2025.[19]
Personal life
Fernández's older brother, Nacho, is also a footballer. A defender, he also graduated from Real Madrid's academy but remained there while Álex moved on.[20][21] Their physical appearance is quite dissimilar, owing to Álex's red hair.[22]