A new study has just exposed what could be a real issue for Newcastle United in terms of their financial fair play position. Newcastle are the richest club in the world on paper thanks to their Saudi owners but they are shackled by the Premier League and UEFA’s spending rules. Essentially, they need to create more income before they are able to unlock the Public Investment Fund’s vast wealth. Commercial revenue, matchday income and player trading are the areas that are under their control, and they havetaken measures to make strides in all three. But in terms of player sales, a new statistical…