According to L'Equipe, Dembele reported back to PSG's training facility in Poissy on Saturday, while Portuguese defender returned on Sunday after both players were granted additional recovery time following the international break.
Their return strengthens Luis Enrique's options ahead of a challenging trip to the Etihad Stadium, where the French champions face one of their toughest European assignments this season.
Dembele's pace and creativity on the right flank remain crucial to PSG's attacking approach, while Mendes provides defensive stability and an overlapping threat from left-back.
