Navas made his 100th appearance for Madrid during the 2–0 second leg home win over Barcelona. During the 2017–18 UEFA Champions League, he started eleven games, as Madrid won their third consecutive and 13th overall Champions League title beating Liverpool 3–1 in the final. The win against Liverpool saw Navas claim his 100th victory for Madrid in only 141 appearances. Navas produced some fine performances in the Champions League including a superb display against Bayern Munich in their semi-final second leg clash which helped Real Madrid qualify to the final. He made 8 saves during the game, his highest tally in a Champions League knock-out game. Bayern Munich manager Jupp Heynckes praised Navas after the game as the reason for Real Madrid's qualification.