Yeah, Juve are strongly linked to him and I think they'll activate his release clause if they can't get Umtiti. They might try to get both of them, even. All their defenders are terrible right now.
goon is right; there are a good 5 years left in him at the very least, and they are peak years for a defender. We'll know a few years in if Holding is going to turn out right, and if not we'll have 8 or 9 transfer windows to do something about it. Manolas knows what it's like to lead in a team full of mismatched players too. Roma just get worse with each passing year and he keeps holding their shape together.
