COULD LIONEL MESSI BE SOLD FOR THREE HUNDRED MILLION POUNDS?

In Spain it is possible for a player to pay out his own buy out clause as the Brazilian Ronaldo did it by paying Barcelona his buy out out his buy clause to join Inter Milan. And Neymar did it to paying out his buy out clause to join P.S.G. So now is the big worry will a club come and make a buy out clause of Lionel Messi for a sum of three hundred million pounds.