Dig around the margins of Chelsea’s vast squad, and you find two of the good reasons why Borussia Dortmund are considered modern masters in the business of buying and selling.
They are Pierre-Emerick Aubameyang and Christian Pulisic. In successive winter transfer windows, Dortmund sold those two strikers for combined fees of more than €120 million ($129m) and upwards of €100m in profit.
That was a few years ago, before the sales by Dortmund of Jadon Sancho and Erling Haaland and just after they had drawn €140m out of Barcelona for a young Ousmane Dembele.
It was a period when €120m was far more than might be routinely paid for a deep-lying midfielder with only six months experience in a European league, like it was last month for Enzo Fernandez.