Known as just Antonio during his playing days, he was born in Ourense, Galicia, and made his senior debut with Tercera División side Villalonga FC at the age of 17.
[7] He achieved promotion to the fourth division in 2016,[8] and on 30 May 2017, after leading Villalonga to an 8th-place finish, he left to become manager of fellow league team Alondras CF.
[9] On 20 June 2019, after leading Alondras to two consecutive play-off qualifications, albeit without promotion to the Segunda División B on both occasions, Fernández left the club.
[11] Ferández led San Roque to promotion during the 2020–21 campaign, and left the club on 6 July 2022, after a sixth-place finish in the season, to take over Primera Federación side Pontevedra.
[13] On 6 March 2024, after more than a year of inactivity, Fernández was appointed at the helm of Segunda Federación side Real Balompédica Linense on a contract until the end of the campaign; he replaced sacked Mere.