Here's the link, it's written in Italian, but basically it says that Danilo Gallinari signed with the team from Milan. All that's left to do is resolve the insurance part, but the deal is as good as done. Because he signed with an European team, he has an opt-out clause when/if the NBA resumes. The source is Gazzetta Dello Sport, the most prestigious sport newspaper in Italy.
Hope he'll perform well there, improve his game and come back stronger and better.