If PSG doesn't sell Mbappe, how are they going to afford to sign Messi, from the wage perspective? I am not sure about breaching FFP since Messi will come for free so it is probably OK.
That's what I'm saying.
They can't sign Messi without breaking the rules. Clubs need to balance football-related expenditure - transfers and wages - with television and ticket income, plus revenues raised by their commercial departments. Money spent on stadiums, training facilities, youth development or community projects is exempt. They just lost over 200m euros due to COVID and lost a lot from their TV deal. Besides, their ticket sales are obviously down.
They're not going to sell either Mbappe or Neymar to bring in a 34-year-old who will only be there for about 3 years.