In a 20-year senior career, he totalled 276 games and 22 goals in the Segunda División over ten seasons, representing mainly Real Oviedo (six years).

[3] Midway through the 2007–08 campaign, Fernández was loaned alongside teammate Samuel San José to Segunda División strugglers UD Las Palmas,[4] and both proved instrumental as the Canarians retained their status, with the former netting four goals.

[5][6][7][8] Fernández had a breakthrough year in 2009–10, playing 29 league matches for Racing and scoring twice, including in a 3–1 win at CA Osasuna on 21 March 2010[9] as they eventually avoided relegation.

Benfica decided to recall László Sepsi from his loan[10] he had virtually no competitor for his position, and helped his team to the semi-finals of the Copa del Rey, notably netting in a 3–2 away victory over AD Alcorcón (which had previously ousted Real Madrid), also the final aggregate score.

[11] After the arrival of Domingo Cisma, Fernández's playing time became more limited, but he still totalled 38 appearances in his last two seasons (as either a left or centre-back),[12] scoring four goals.