You would be surprised then.
sometimes clubs will accept anything just to get the wage off their books and sometimes sell players without actually having paid in full for him yet - its not much different from buying a car.
It depends ........
A lot of the time clubs agree on a player and pay it off in agreement, depends on the club, depends on the situation. The club even sometimes write the whole amount in their books down to make their value higher even though it will be 1 -5 year later when its all paid off