We're not a selling club, keep him because it sends out the right messages. Players shouldn't think that the grass is greener on the other side while being in Juventus.
But with that said, if there is one top performer we can afford to lose if a team like PSG are willing to pay big money its Licht. We're already stacked in the position with Isla and Caceres to replace him with. And to be honest the 3-5-2 we're making as our man formation doesn't fit Licht as well as the back 4.
Oh, and according to Wikipedia he's already a PSG player