Hernández scored his first senior goal on 14 April 2019, netting the opener in a 4–1 home success over CD Binéfar.[2] He made his first team debut on 16 December of the following year, starting in a 2–0 away win against Gimnástica de Torrelavega, for the season's Copa del Rey.[3][4]
Hernández made his professional debut on 5 January 2021, coming on as a late substitute for Alberto Guitián in a 1–2 loss at AD Alcorcón, also in the national cup.[5]