Off contract at Manchester City at the end of June, the veteran midfielder has agreed personal terms with the Serie A title winners.
Transfer expert Gianluca di Marzio is reporting De Bruyne will sign with the Azzurri in the coming days.
Contracts will be settled on Monday, with a final agreement now regarded as a formality.
De Bruyne will then undergo a medical ahead of putting pen to paper on a two-year contract plus a 12-month option.