Doesn't matter who gets involved for PSG. IF Monaco don't wanna sell to them then they wont. They either have us or Madrid Who seem willing to pay 100m+. If they sold Mbappe to PSG they would be handing the French league to them for the foreseeable future. However PSG are far from a complete team. Mid / DEF / GK still all kinda lacking.
Also if Mbappe is so focussed to go Madrid one time in his career I can't see PSG selling him unless its a stupid fee or he runs his contract down, which i'm assuming would at least have to be a 6 year one. Seen with Verratti, he got bitched into staying and apologised for wanting to leave...
As i've said before. To even think about getting Mbappe PSG would need to sell at least 4/5 of their high earners who aren't even first team players. (Lucas, Aurier, Krychowiak) Even Di Maria? ... A lot of things will need to fall perfectly and then Monaco probably still say no.
Really falls down to if Madrid want him this summer. I think he's our if not.