Nacho scored his first career brace on 21 January 2018, in a 7–1 win over Deportivo de La Coruña. During that year's Champions League he made eight appearances while scoring one goal, when Madrid won their third consecutive and 13th overall title in the tournament; in the decisive match against Liverpool, he featured at right-back after replacing the injured Dani Carvajal late into the first half of an eventual 3–1 win in Kyiv.