 Fernández scored in his Necaxa debut in a 2–1 victory against Club América in the first round of the 2018–19 Apertura season.He scored four goals in 15 Torneo Apertura appearances, and twelve goals in 15 Torneo Clausura appearances, as well as two goals in two Copa MX appearances, both scored as a substitute in a 3–2 loss to Atlético San Luis.Necaxa qualified for the Clausura Liguilla playoffs, but Fernández did not participate because a transfer agreement for him had been reached.