BBC sports editor
The UK government has been challenged by opposition MPs to impose sanctions on two billionaire oligarchs linked to English football clubs.
It comes after Russia's detained opposition figure Alexei Navalny called for action to be taken against Chelsea owner Roman Abramovich and Alisher Usmanov, who has ties with Everton.
The government said it was "considering all options for further action".
Mr Navalny has been detained since 17 January, after returning to Moscow for the first time since he was poisoned last year.