British police, who did not name Glushkov, said that they were investigating the death of a man in his 60s who lived on Clarence Avenue.
Mr Glushkov was discovered by his family and friends at his house in New Maldon, in London's south-west, late on Monday night, aged 68, the Guardian said.
Sky News' home affairs correspondent, Mark White, said Mr Glushkov's home in New Malden, southwest London, is being treated as a crime scene.
"The death is now being treated as an unexplained", said London police."There is no evidence to suggest a link to the incident in Salisbury".
Glushkov's death came a week and a day after fellow Russian exile Sergei Skripal and his daughter Yulia were critically injured in a nerve agent attack in Salisbury. He was known as the "godfather of the Kremlin" before fleeing to London in 2000 after a row with Russian leader Vladimir Putin. Whilst we believe we know the identity of the deceased, formal identification is yet to take place. "If there is a change in the status of the investigation, an update will be provided", the Met said.
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In March 2013, Berezovsky was found hanged in his ex-wife's home.
The death of Glushkov, who worked for Berezovsky's auto company as well as Russian state airline Aeroflot in the 1990s, was confirmed by his lawyer on Russia's Business FM radio. His death was not treated as suspicious, but his friends were not convinced and a coroner later recorded an open verdict.
In 2017, during a trial in absentia in Russia, Glushkov was sentenced to eight years in prison for stealing $123m from Aeroflot.
Glushkov had said at the time that he did not believe Berezovsky died of natural causes.