Marquinhos began the 2017–18 season on 29 July, starting as PSG won 2–1 in the 2017 Trophée des Champions at the Grand Stade de Tanger in Morocco. In the team's victorious run in the Coupe de la Ligue, he scored in the 3–2 semi-final win at Rennes on 30 January 2018, but was unused in the 3–0 final win over Monaco as young local Presnel Kimpembe took his place. PSG won all four domestic competitions over the season, and Marquinhos told "Le Figaro" at the end of the campaign that he would remain at the club.