Fernández scored both goals in a 2–0 victory for Racing in his debut in the 2014–15 Copa Argentina against Independiente de Neuquén.

[5] After a slow return to Racing's professional squad in 2017, manager Diego Cocca had Fernández loaned out to Primera División side Sarmiento in May.

[9] The 23 year-old scored 11 goals in 12 league matches for Unión La Calera, helping to deliver one of the best seasons in the club's history.

On 7 June 2018, Liga MX club Necaxa confirmed the signing of Fernández on a three-year contract from Racing for a reported $3 million.

On 7 October 2019, it was announced that Fernández has voluntarily entered MLS' Substance Abuse and Behavioral Health Program.

[15] Following his dismissal by Portland, Fernández moved back to his native Argentina, joining Argentine Primera División side Colón on 10 January 2020.

[21][22] Fernández joined Ferro Carril Oeste in late February 2021 on a loan deal for the rest of the year.

[25] However, the spell at Deportivo Madryn was cut short and he instead returned to Ferro Carril Oeste on a loan deal until the end of the year.

"[27] Fernández returned to Chile after his stint with Unión La Calera for the 2025 season and joined Coquimbo Unido on 10 December 2024.

[4] The South American Football Confederation (CONMEBOL) did however seek a two-year ban for him, and he was still suspended in late September 2015.