The full-back was named in Luiz Felipe Scolari's Brazil squad for the friendly against Switzerland on August 14, after being virtually ever-present for PSG last season.
He told Ligue 1's official website: "I am very happy, but also a bit surprised. I just want to make the most out of this experience.
"I will be playing alongside some great players, most of whom are friends and I will try to give it my absolute best."
Maxwell should start at left-back for PSG tomorrow in Laurent Blanc's first competitive game in charge against Bordeaux in the Trophee des Champions.