Navas’ fifth season at Real Madrid began with the much-anticipated arrival of Thibaut Courtois to compete for the number 1 goalkeeping spot. Despite Courtois’ arrival, Navas was selected to play in the 2018 UEFA Super Cup which resulted in a 2–4 loss to city rivals Atlético Madrid. Navas then went on to start the opening game of La Liga, comfortably keeping his first clean sheet of the season with a 2–0 win over Getafe CF. His performances in the last Champions League campaign led him to be voted as the 2017–18 UEFA Champions League Goalkeeper of the Season beating off competition from then Roma goalkeeper Alisson Becker and Juventus goalkeeper Gianluigi Buffon. On 9 January 2019 Navas made his 150th appearance in all competitions for Madrid in their 3–0 home win against Leganés in the Copa del Rey. On 6 April 2019 Navas became the first ever non-Spanish goalkeeper to reach 100 La Liga appearances for Real Madrid.