 In June 2017, Hernández became co-owner of Spanish club CD Castellón (alongside former Valencia teammate Ángel Dealbert and others), where he had started playing 20 years ago.Under his first season of ownership, it won promotion from Tercera División; they both left due to disagreements regarding the team in April 2019, but kept their position as shareholders.Hernández' wife, Mar García, is the sister of professional golfer Sergio García, who competed on both the PGA Tour and the PGA European Tour.