This time last year, no one really knew what they were, as Chelsea dropped nine figures on Enzo Fernandez: 12 months on, they're a volume limit on the headphones of spending, curbing transfer window whispers from developing into anything even resembling an indoor speaking voice.
It's a problem for every single club looking to buy this month or any other and on top of everything else, it delivers a kick in the teeth for fans in its own little way.
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