The Saudi Pro League has been known for their ability to offer players irresistible financial benefits to accept offers from their clubs but Messi seems to be more interested in staying put with Inter Miami. I believe Barcelona made a move for Messi last year but he wasn’t interested. AFAIK that talks are ongoing between Messi and Inter Miami to extend his contract with the club. I doubt we will see Messi and Ronaldo in the same league one last time.
Barcelona could not bring Messi back to the club, because they have financial problem and that was the reason they let him leave for free to Psg. Messi form has reduced and he's play football for fun nothing else unlike Ronaldo that is still eager and hungry for title. Messi has lost the passion and i do not think if he can play in any other leagues again. Messi will review his contract with Miami and they will renew it once its expired, i have so much hope that Messi will remain in America league.
The Saudi Arabia pro league clubs approached Messi last season but they could not get him to sign for any of the clubs, and i still not see the possibility for any of the club to sign him in the future. Saudi Professional league is very tough for Messi, he doesn't want to play in a very competitive league anymore, even with high pay from Saudi pro league club Messi will still turn it down, the possibility of having both Messi and Ronaldo in same league should just die in our hearts, they both have fewer years to play, let enjoy their last lap.