Transfer business concentrates into the final hours of a window every time, and the pattern is not about drama or brinkmanship. It follows from the fact that most deals depend on other deals.
Deals form chains
A club will not sell its first-choice player until a replacement is secured, and the replacement's club will not sell until it has secured its own.
Each link waits for the one before it, so a chain of four clubs cannot move until someone at the end commits without cover.
Deadlines force that commitment, which is why chains resolve in a rush rather than gradually across the window.
Waiting is rational for both sides
A selling club that holds out may receive a better offer from a buyer whose alternative targets have gone elsewhere.
A buying club that waits may find prices falling as sellers face the prospect of keeping an unwanted player for months.
Both beliefs are reasonable and mutually incompatible, so the standoff continues until the deadline resolves it. Neither party gains anything by moving first, and the calendar is the only thing that eventually forces one of them to.
The paperwork constraint is real
Registration requires signed contracts, international clearance, medical sign-off and in some cases work authorisation, all lodged before a fixed time.
Systems exist for submitting incomplete documentation with a short extension, and deals still fail over administration rather than over disagreement.
Time zones complicate cross-border transfers further, since the deadline is set locally and the selling club may be operating in another one.
Why late deals go wrong more often
Due diligence is compressed, medicals are hurried and personal terms are agreed under pressure, all of which raise the chance of a poor decision.
Clubs signing in the final hours are usually solving a problem they failed to solve earlier, which is not a strong position to negotiate from.
The players available at that point are also, by definition, the ones nobody moved for earlier in the window, which is information about them that the urgency tends to obscure.
What the pattern means for reading rumours
Stories in the last days describe a market where nearly everything is provisional and dependent on something else completing.
A deal reported as close may be genuinely close and still fail because a club three links away chose to keep its player.
Understanding the chain explains more about a window's outcome than any individual report about any individual player does.