Marquinhos began the 2014–15 season on 2 August in the Trophée des Champions, playing the whole 90 minutes as PSG won 2–0 against Guingamp at the Workers Stadium in Beijing. In the 32nd minute, he gave away a penalty kick by fouling Claudio Beauvue, but Salvatore Sirigu saved the penalty shot from Mustapha Yatabaré. His first goal of the season came in a 2–0 win at Caen on 24 September, heading in Javier Pastore's corner. On 26 March 2015, Marquinhos signed a one-year contract extension to keep him at the team until 2019. Club president Nasser Al-Khelaifi said that, "The biggest European clubs were interested in signing Marquinhos, so this contract extension further reinforces Paris Saint-Germain’s ambitious long-term project." As the right-back in an all-Brazilian defence (alongside Maxwell, Thiago Silva and David Luiz), Marquinhos featured in PSG's 3–2 win at Marseille in "Le Classique", scoring the equaliser. Six days later, he started in the 4–0 victory over Bastia in the 2015 Coupe de la Ligue, his 34th consecutive game without a defeat for the club, surpassing a record set by George Weah. On 16 May, PSG won their third consecutive league title with a 2–1 victory at Montpellier, with Marquinhos playing the final 12 minutes in place of Yohan Cabaye. Two weeks later, he was an unused substitute as the team finished a perfect domestic season with victory in the Coupe de France final against Auxerre.