The offer Real Madrid received for Vinicius Junior from Saudi Pro League clubs is tempting, and if Real Madrid decides to let Vinicius Junior move to the Saudi Pro League, the money they will realize from the Vinicius deal will help them sign a lot of players from different clubs, but I think Real Madrid isn't yet ready to sell Vinicius Junior, and Vinicius Junior won't want to move to the Saudi Pro League because he still wants to play for Real Madrid and have a chance of winning personal awards like the Ballon d'Or Award, so any possible deal for Vinicius Junior to move to the Saudi Pro League won't happen this season.
Real Madrid value Vini's contribution to the team, and they really want to keep him, but if he leaves, it won't be Real Madrid's doing. AFAIK, he has been handed a new contract, but he's asking for a higher salary. I don't know the details of the new contract, but I'm guessing it's more than what he was earning, and if they cannot reach an agreement, Real Madrid will have no other choice than to sell him. He has already been given a deadline to sign, or he will be put up for sale.
Of course, Real Madrid values Vinicius' contribution to the team, But right now we can see that even though he publicly expressed his desire to remain in this group, his actions still suggest a different situation. Basically, this player has not yet completed a new contract, so I think the longer they negotiate the contract
, the more opportunities the Saudi Arabian club will have to provoke there and they can definitely become opportunists for this player.