In 2011, Fernández was sent on a one-year loan to Temperley in the Primera B Metropolitana. He made 30 appearances, scored 10 goals and made eight assistances for the side during that season.
In 2012, Fernández returned to Gimnasia, then recently relegated to the Primera B Nacional. He promptly earned a spot in the starting lineup and contributed with three goals and eight assists to the club's return to the first division. On 17 August 2013, he scored his first Primera División goal, the last in a 3–1 win over Rosario Central.[5]
Fernández was the top scorer of Gimnasia in the 2015 season, with nine goals.
Fernández appeared in 12 of the 14 matches of River's campaign in the 2018 Copa Libertadores, including both legs of the final against Boca Juniors. In the second leg, he assisted Lucas Pratto's equalizing goal, which forced the contest into extra-time; River scored twice in the added 30 minutes and won the title, which had extra significance in the fact that it was the first time a Superclásico was contested in the final of a continental competition.[12]
On 20 February 2021, Fernández joined Brazilian club Atlético Mineiro on a three-year deal.[16] The transfer fee was a reported US$ 6 million, placing it as a joint-record signing for the club, alongside the deals for Yimmi Chará and Matías Zaracho.[17] He made his debut on 19 March, in a 3–0 Campeonato Mineiro win over Coimbra; he opened the score, assisted the second goal for Igor Rabello and was fouled in the box, with Hulk scoring from the resulting penalty kick.[18]
Fernández was one of the team's standout players for much of the season, playing in an attacking midfielder role behind center forward Hulk; his performances in the victorious state championship campaign earned him a nomination to the team of tournament.[19] On 2 July, he scored twice in a 4–1 Série A win over Atlético Goianiense.[20] On 14 October, he took part in all three goals of a 3–1 league win over Santos, scoring a brace and assisting a Nathan Silva header.[21]
In the final stretch of the Série A and the Copa do Brasil, after facing a series of muscle injuries coupled with the consolidation of Diego Costa in the starting lineup, Fernández was restricted mainly to making second half appearances.[22] Despite this, his overall contribution to Atlético's domestic treble winning season, with 10 goals and 11 assists in 52 games, earned him nominations to both the Prêmio Craque do Brasileirão and Bola de Prata awards.[23][24]
Return to River Plate
On 22 December 2022, River Plate announced the return of Fernández to the club.[25]
International career
In May 2017, Fernández received his first call up to the Argentina national team.[26] He made his international debut in a friendly win against Singapore on 13 June, coming off the bench in the 75th minute and assisting an Ángel Di María goal to complete the 6–0 score.[27]
^"Estreia de Galo" [Galo's debut] (in Brazilian Portuguese). Clube Atlético Mineiro. 19 March 2021. Archived from the original on 20 March 2021. Retrieved 20 March 2021.
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