FIFA? You meant UEFA, right? La Liga has Financial Fair Play, and UEFA has FSR rules. These rules already say how much a team can spend in a season. A La Liga team can spend 50% of its revenue on player transfers. UEFA set their limit at 70% for a team can spend it on player and coach wages, transfers, and agent fees.
It's impossible to limit the player's price. This is because it depends on the club that owns the player's contract. How can UEFA value the importance of player for the club, without the club itself who can value their player?
Yeah, Uefa.
Given the fact that, the club who owns the sort out for players contract gets to value the player makes it very difficult to come to terms with offering a player for transfer about a price range but, I can imagine where they could come to terms with a particular inflation ratio in retrospect to what the player was bought for. A loophole might arise here in terms of groomed academy players but, the wages paid to such player could be used in the equation. Am just trying to give a perspective about this because, it really does affect some teams. In the end, it’s a thing of choice and management as, you’ve got choices you could go for than an expensive player.