Deals are often won in the headline terms and lost in the sub-clauses.

The transfer window is open and release clauses are being tested all over Europe right now. Every deal you'll read about this summer was agreed on its headline terms. A fee, a salary, a start date. Whether it actually completes is decided in the wording underneath, and that wording is where smart agents earn their stripes.

I'll unpack 3 parts of a release clause that few people scrutinise properly, and how each one can change a deal completely.

1. The confidentiality waiver

Every clause in a playing contract is confidential by default. Neither the player nor the agent is permitted to discuss it, or even confirm it exists.

Now apply that to a £20 million release clause. You can't approach a buying club and make them aware of it, because in disclosing it you'd be in breach of the very contract the clause sits in. And if nobody knows about it, nobody activates anything.

The fix is a confidentiality waiver carved into the wording of the clause itself. I've seen contracts where that waiver is absent, which makes the clause functionally useless. The player believes he has a way out. Without the waiver, he has a clause he can never use.

2. The payment terms and the expiry date

Presume the waiver is in there. A club knows about the clause and is willing to pay it. The next question is how and when.

Transfer fees are almost never paid in one go. They're usually spread over 2 or 3 seasons. But some clubs stay silent on the payment timing of a release clause, or go further and stipulate 100% must be paid within 5 days for the clause to be triggered. In practice, that makes the clause almost impossible to meet.

Then there's the expiry date. I've seen contracts where the selling club wanted the release clause to expire on 1 July, arguing they didn't want the player bought on deadline day with no time to find a replacement. Understandable in principle. But that date gives only 4 weeks of the open window to find a buyer at that price, unfairly weighted in the club's favour. (I argued 8 weeks was ample time to replace a player, and we settled on 1 August).

3. Who actually makes the payment

About 12 years ago, I was involved in a deal for a player at Eibar, in La Liga at the time. In Spain, a release clause works differently. The player pays it, personally, via the league. The buying club advances the money into the player's bank account, and the player pays it on to his club.

Back then, the Spanish tax authorities treated that advance as personal income. It could add up to 48% on top of the fee once the money had routed through the player's account. Eibar understood this well. They had no need to negotiate a normal transfer, because the clause route carried a tax bill that priced buyers out. It blocked the deal.

Spain changed the tax treatment in late 2016 and the route is now tax neutral. The lesson travels to every jurisdiction though. Who pays, and how the money moves, is as much a part of the clause as the number itself.

This is the level of scrutiny that contracts demand.

Every successful sports executive I know has been caught out by a clause or a piece of wording at some point in their career. The excitement of getting a deal over the line is exactly when these things slip through.