The release clause. Is there anything more unnecessary in the world of football?
Inserted into contracts to give players confidence that they will be allowed to leave if another club is willing to meet a certain figure.
But if valuated wrong, it can leave clubs with no choice but to sell their best players for well under what their value would be otherwise.
Some clubs guard against this and put ridiculous numbers on them to the point where there is little reason to have any figure at all.
Here we take a look at six players who have release clauses that could prove to be significant in the near future.