Djordjevic moves to the Biancocelesti on a free transfer after seven seasons with Nantes, with the 26-year-old Serbian having agreed a pre-contract earlier this year.
“SS Lazio announces that it has filed the contract of Filip Djordjevic,” a brief statement on the club’s official website confirms.
Meanwhile, Basta has signed a four-year-contract for a fee reported to be in the region of €5.5 million and Parolo joins for the same price, though his deal is thought to also include add-ons.
“SS Lazio communicates that it has deposited the contracts of Dusan Basta and Marco Parolo,” a second statement read.
Parolo, who has signed a five-year contract, scored eight goals in 36 league appearances to help Parma finish sixth in Serie A last season and featured for Italy in two games at the World Cup 2014.