On the calendar site, calendar.google.com you go to Other Calendars on the left and then go to Sports, Serie A, Juventus and choose subscribe, you can also go to Coppa Italia and do the same or any other competition/team you want. I assume that as soon as the draw is finished the CL schedule will be there as well. After than all the events you subscribed to will appear in your Google calendar and with the right time and consequently on your Android phone if you have one.