I agree that something should be done. But that means a player can be paid double his salary during one week? Where does that money go?
So maybe it would be better if when you sell a player on wednesday, you pay for his monday and tuesday salary, and the one who buys the player pays for the rest of the week.
Or you could say 2/5 for a league game and 1/5 for a scrimmage, or 1/3 for a league/cup game if you're still in the cup.
So if you are out of the cup, you sell a player after tuesday's game, you still pay 2/5 of his salary.
That means if you buy this player on wednesday and you sell him on sunday, next monday you still pay 2/3 of his salary if you're still in the cup, or else only 3/5.
"Air is beautiful, yet you cannot see it. It's soft, yet you cannot touch it. Air is a little like my brain." - Jean-Claude Van Damme