West Ham have been stopped from helping their players by painting the area around the pitch at the London Stadium a darker colour.
Manager Slaven Bilic is convinced that it would aid his squad if they were allowed to change the colour of the area around the field to claret - and West Ham are prepared to spend £200,000 on it.
But he says that the club have struggled to get permission from the necessary powers behind the London Stadium.
Bilic has admitted he wants to have these improvements at the ground, using PSG's Parc des Princes as an example.