Abramovich has been counted as one of the richest men in Britain since he bought the English Premier League soccer club in 2003. His British visa expired last month and sources have told Reuters it was taking longer than usual to get it renewed. The British government has declined to comment on his case.
The Ynet website that belongs to Israel's biggest selling daily, Yedioth Aharonoth, said Abramovich, who is Jewish, jetted into Tel Aviv on Monday and had received documents confirming his status as an Israeli citizen.
An Israeli immigration absorption ministry spokeswoman declined to comment on the report citing individual privacy but a spokeswoman for the Population Administration which oversees border control confirmed that Abramovich was in Israel.
A spokesman for Abramovich also declined to comment on the report.
Israel grants citizenship to any Jew wishing to move there, and a passport can be issued immediately. Israeli passport holders can enter Britain without a visa for short stays, although they require visas to work there.
Relations between Moscow and London have been strained since the poisoning of former Russian double-agent Sergei Skripal in Britain in March, an act Britain has blamed on Russia but in which the Kremlin denies any involvement.
Abramovich has been a regular visitor to Israel and Ynet said he had bought a property that was formerly a hotel, in an old Tel Aviv neighbourhood close to the Mediterranean shore.
(Additional reporting by Alistair Smout in London, Writing by Ori Lewis)
