I know this is is pure WILD speculation, but something to consider is that if Mbappe goes to Real Madrid and we can't get Haaland...both likely to me...
This might make Neymar available as PSG would even more appear to be in a rebuild phase and don't have a great side now as they haven't invested.
Yes, Mahrez we know may want to go there (who we'd likely sell to find space) only if Neymar is there, but we could probably sell him to a top 6/8 PL side fairly easily given his proven record in the league.
Even more bonkers and awesome would be bring he AND Messi in to reunite.
You think you'd have to move Sterling...however you can play Neymar as the striker, which could work.
This would be a massive coup for the club in terms of finances (I suspect) and exposure to counter the loss of Haaland and Mbappe.
I also know a good number of our fans would HATE this idea and probably want to kill me or slate me as some out there fan who doesn't get it, but we are already in for Messi, or at least we were.
They like each other and Neymar has not had a chance really to get what he wants.
His attitude bothers some I know, but he is still a top 5 player in his prime. I'd do this in a heartbeat if it was at all possible.
You do have to consider about the ownership of PSG and how they may NEVER sell to us, just like with Mbappe given the poor relations between Qatar and UAE (arguably partially why UEFA went after us and neglected them for FFP given their former Prez being on the board).