Breaking news, Mbappè will probably leave PSG this summer. 
Real Madrid opened the hunting.
It'll be a disaster for Paris Saint Germaine if for anything Kylian Mbappe leaves for the French capital this season.Real Madrid opened the hunting.
They've already lost important players like Sergio Ramos, Lionel Messi and Neymar's future is still uncertain. Mbappe is currently the best player in PSG set up and if he happens to leave at the end of the season, PSG will really struggle come next season
I don't think PSG will let him go for free. as quoted by Fabrizio Romano, PSG has no plans to lose Mbappe for free. Sign a new contract now or he could be sold. Previously, Kylian Mbappe had informed PSG of his decision : he will not trigger the option of extending his current contract until 2025, meaning the deal will expire on June 24. well, in case PSG will just let him go, I don't think so. as I said in the first point, PSG has no plans to lose Mbappe for free. that means, they have other plans if Mbappe doesn't want to sign his new contract. in other words, sold. ideally, to make money PSG would do it.
Regarding the Mbappe issue, I don't think PSG will be worried even if he leaves. The thing is, PSG have the finances to sign any player they want. that means, PSG can reform with the new squad. well, it looks like Nagelsmann is suitable to be their new coach.