The Frenchman ended a frustrating spell at Sunderland after having his contract terminated by mutual consent in January and has agreed to join the Serie A side
The 34-year-old agreed to leave the Black Cats in January, just six months into the one-year deal he had signed upon his departure from Tottenham over the summer.
And he has had little trouble finding a new club, with the Serie A outfit set to unveil their new forward at 18:00GMT.
Saha first came to England with Newcastle in 1999 before enjoying spells with Fulham, Manchester United, Everton, Tottenham and Sunderland.
The Frenchman scored 112 Premier League goals in total.