The Tier 1 investor visa that Abramovich has used to visit London regularly in recent years expired in April, and has yet to be renewed amid reports that United Kingdom authorities had demanded that he declare the source of his vast fortune as political tensions with Russian Federation escalate.
Relations between Moscow and London have been strained since the poisoning in Salisbury of the former Russian double-agent Sergei Skripal and his daughter in March.More news: Meghan Markle's Mother Doria Ragland Spotted Back in US After Royal Wedding
Abramovich has not commented on recent developments.
Abramovich, worth an estimated £8.6billion, exercised his right under Israel's Law of Return, which grants citizenship to Jews wishing to move there.
Abramovich bought Chelsea FC in 2003.More news: ABC cancels 'Roseanne' following star's racist tweet
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. British authorities have declined to comment, saying they do not routinely comment on individual cases.
Britain has blamed the attack on Russian Federation but the Kremlin denies any involvement.
Abramovich, who is Jewish and has been a regular visitor to Israel, has donated millions to Israeli research and development projects and invested in local firms.More news: Eric Cowell steals the show on Britain's Got More Talent