While Inter must win and hope that Milan lose or draw (in that case I think the difference in goals counts)
If I'm not mistaken, if Milan draws against Sassuolo, Milan will still win, because before the goal difference, the decision should have been decided by Head to Head, Milan won Head To Head this season over Inter (CMIIW). So, if Inter want to win scudettp, Milan must lose. But this is not my hope. It's been 10 years since Milan didn't win Serie A, hopefully this season can give Milan the 19th title and the most beautiful gift after waiting a decade.

It’s not been easy and long years of waiting for one of Europe prestigious club in Italy, finally there’s light at the end of the tunnel now. AC Milan need to win Sassuolo this Sunday and break the barrier of not being dominant in the league for a long while. Winning that game will guarantee their first Scudetto in a decade and that will be a great story to tell.