The Rossoneri had already earmarked their former youth product as the heir to Alessandro Nesta, but now have reportedly struck a deal with Massimo Cellino to bring him back
A contract extension for Alessandro Nesta is also becoming an increasingly complex procedure, as the champions have doubts over his long-term durability at the highest level.With Juventus also understood to be showing more than just a passing interest in the veteran defender, vice-president Adriano Galliani and sporting director Ariedo Braida have since identified his potential successor in Astori.
A former Milan youth player, Astori left San Siro to join Cagliari in 2008 and has since flourished into an Italy international, having formed impressive defensive partnerships with the likes of Michele Canini and Leandro Ariaudo.
He is also well-acquainted with current Rossoneri boss Massimiliano Allegri, having overseen arguably his best season to date during 2009-10 at the Sardinian club.
Meanwhile, if a move for Astori breaks down, Palermo's Matias Silvestre and Vasco da Gama's Dede are next on Galliani's summer shopping list. Fiorentina stopper Cesare Natali is also being primed to join Milan as a replacement for Mario Yepes.
Milan face Parma on Saturday, with kick-off at Stadio Ennio Tardini scheduled for 17:00CET.