Roman Abramovich's future as Chelsea owner is in doubt after a Swiss billionaire claimed he has been offered the chance to buy the club.
Abramovich gave "stewardship and care" of Chelsea to its foundation trustees following Russia's invasion of Ukraine.
Chelsea have chosen not to respond to Wyss's claims.
The west London club have always previously denied reports that they are up for sale.
Abramovich, 55, is believed to have strong ties to Russian president Vladimir Putin, and other Russian billionaires have already been the subject of European Union sanctions where their assets have been frozen.