From one summer to the next one, the price of the players is multiplied as well as the highest player's price in the history, at least by 2 times. As a result, due to the permanent elevation of the prices of players , and due to the new emerging laws in our sports which is : money is every things !
Could we see some deals paid in bitcoin ?
I believe that at the current bitcoin scenerio, it is going to have some law problems, as it is impossible to pay taxes with bitcoin, and paying tax on a player transfer is a must.
Anyway, I believe that if a serious player will insist that he wants his transfer to be done in bitcoins, he is going to get it, and the team who bought him will take care of all the problems that may appeal.
If bitcoin is going to become mainstream anytime soon, and is going to be considered as a legal money, then I guess that we will see a large amount of players getting paid in bitcoins( if it will be considered as a regular money, then they are actually getting paid in money, not in a virtual currency).