The 27-year-old has been a stalwart for the Italian giants across the last seven campaigns, developing into one of the best defenders in the world.
Bastoni has helped Inter clinch the Serie A and Coppa Italia double this season, extending his trophy haul with the club to nine major honours.
As such, Bastoni's performances have caught Barcelona's attention, with Hansi Flick keen on signing a left-footed defender to partner Pau Cubarsi.
Sporting director Deco has identified the seasoned Italian international as the perfect candidate to improve their back line, although Flick isn't convinced by his technical attributes and has ordered Deco to explore other options.
That is perhaps a blessing, as The Athletic report that the Nerazzurri want around €80million (£69.2m) for the Italian, essentially pricing Barca out of a move.
Gazzetta dello Sport have even revealed that Bastoni is "happy" in Milan and could stay at the San Siro beyond this season, making a deal even more difficult to strike.