[6] He made his professional debut on 17 August, coming on as a second-half substitute for Manu Vallejo in a 1–0 home win against UD Almería.
[8] Upon returning to Celta, he was assigned to the main squad, and made his top tier debut on 15 December 2019 by replacing fellow youth graduate Kevin in a 2–2 home draw against RCD Mallorca.
On 27 August 2020, Hernández renewed his contract with Celta until 2022, being immediately loaned to second division newcomers CE Sabadell FC for the season.
[9][10] On 7 July of the following year, he agreed to a two-year deal with fellow second level side AD Alcorcón, after cutting ties with the Galicians.
[11] Despite being regularly used at Alkor, Hernández terminated his contract on 26 January 2022,[12] and moved to fellow second division side SD Ponferradina two days later.