People here come with false common consensus about homegrown rule. Based on uefa website
'homegrown' players as those who, regardless of their nationality, have been trained by their club or by another club in the same national association for at least three years between the age of 15 and 21. Up to half of the locally-trained players must be from the club itself, with the others being either from the club itself or from other clubs in the same association.
And the rules in champions league, team must include minimum 8 homegrown players
So basically not only de ceglie, gio, marchisio are our homegrown players. But Buffon, storari,bonucci,chiellini,barzagli,ogbonna,peluso,Motta,pirlo,padoin,quag are our homegrown players. Even pogba if he stay in Italy until next year when he 21 years old and spent 3years in Italy football.
It also our Homegrown players if we sign nainggolan,diamanti and sell de ceglie. We already has more than 8 homegrown players