The Nerazzurri have struggled in pre-season and Simone Inzaghi warned the squad was not yet complete as they head into the opening weekend of Serie A.
Casadei is the 19-year-old star of their Primavera youth team who has never played for the senior squad, yet is at the centre of a €15m bidding war between Chelsea and OGC Nice.
Now Sky Sport Italia claim that Sassuolo are new contenders for his signature and, unlike those clubs, would be prepared to give Inter a buy-back clause.
That and the promise of regular playing time in Serie A to aid his development could prove crucial for both player and club.
Meanwhile, the search for a defender also goes on and there are seemingly two main targets.
The favoured option for Inzaghi would be Switzerland international Akanji, whose contract with Borussia Dortmund only runs to the end of this season.
However, a low-cost alternative is Lazio veteran Acerbi, as it’s claimed agent Federico Pastorello would bring him to Inter free of charge as long as the San Siro side pay the full outstanding salary.
Acerbi has been left out of Lazio pre-season games, as his rapport with the fanbase is rock bottom.