Benevento are eager to expand their Arsenal old boy contingent.
France international Sagna, 34, was a free agent after leaving Manchester City last summer.
Now Benevento chiefs have now made approaches to sign his old Arsenal team-mates too.
Nasri, 30, is without a club after leaving crisis-hit Turkish outfit Antalyaspor last month.
Meanwhile, 30-year-old Cameroon international Song recently won his release from Rubin Kazan after the Russian club reportedly failed to pay his salary.