I genuinely don’t know. I suppose the transfer is subject to work permit. It could be risk free potentially as you either get the player or you don’t make the transfer. I really don’t know the contract law or the process surrounding a transfer.
As an aside it is a market that I think is underused. It seemed that there used to be a South American wonder kid always moving to Europe, usually Serie A, in the last decade. This could still be happening but as I’m not as wired in to international football as I used to be, I don’t notice. If not, you’ve got to wonder why, especially in a modern football age where every competitive edge seems to be utilised. Perhaps this is due to WP complications and ‘homesickness’.