Chelsea owner Roman Abramovich is demanding an extra £500m from the successful bidding consortium.
Sky News says the trio of billionaire-studded consortia were informed in the last 48 hours of Abramovich's request.
They state that the Russian wants this figure guaranteed to increase the pot that will be handed to charitable causes.
It is believed that this total will see the value of Chelsea reaching at least £2.5billion - with £1bn of that being donated to charities.
Abramovich, 55, was sanctioned last month on the back of his homeland Russia's invasion of Ukraine in February.
Abramovich had already lined up to sell the club following the invasion, and he still will be able to do so as long as he doesn't financially benefit from the sale.
Chelsea must now operate under a stringent government licence, to ensure Abramovich does not profit from it.
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