Mali midfielder Mohamed Sissoko and Italian international goalkeeper Salvatore Sirigu have completed moves to Paris Saint-Germain, the French club announced on Thursday.
Sissoko, 26, was born in France but represents Mali at international level and has never previously played in Ligue 1.
He enjoyed spells at Valencia and Liverpool before moving to Juventus in 2008 and has now penned a three-year deal at the Parc des Princes.
Meanwhile, 24 year-old Sirigu, who has two caps for Italy, has signed a four-year contract after leaving Palermo.
The moves are a further indication that PSG are determined to establish themselves as a major force following the arrival of Qatar Sports Investments (QSI) as majority shareholders and the appointment of Leonardo as sporting director.
The club have now made seven signings this summer, with Nicolas Douchez (Rennes), Kevin Gameiro (Lorient), Milan Bisevac (Valenciennes), Blaise Matuidi (Saint-Etienne) and Jeremy Menez (Roma) already having put pen to paper.
More are likely to follow, with Leonardo reportedly close to agreeing a sensational 30 million-euro ($43 million) swoop for another Palermo player, Argentine playmaker Javier Pastore.