What's there to worry about? Yes, Dembele probably won't play in those 3 matches, but there are still many substitutes who can cause chaos in front of the opponent's goal like Dembele, after all, Lens, Lille, and Olympique are not in their best form, maybe only Lille because they have a sharp attack line so far, of course it can't be 100% guaranteed that PSG can collect full points from them, but it won't change anything.