On 6 August 2020, Eredivisie club Heerenveen announced the signing of Fernández on a three-year deal.[2][3] On 4 March 2021, he returned to Uruguay by signing for Montevideo City Torque on a loan deal until the end of the year.[4] On 15 January 2023, he joined Boston River.[5]
On 1 February 2024, Fernández signed a one-and-a-half-year deal with Bulgarian First League club Levski Sofia, becoming the first ever Uruguayan to join the club.[6] Four months later on 1 June, his contract was terminated by mutual consent.[7]
On 12 July 2024, Fernández joined Mexican club Dorados.[8]
International career
Fernández has represented Uruguay at under-18 and under-20 level.[1]
Personal life
Joaquín is the younger brother of Progreso midfielder Fabricio. Fernández also holds an Italian passport.[3]