LONDON — Roman Abramovich, the Russian oligarch whose vast fortune transformed Chelsea into a global soccer powerhouse, confirmed Wednesday that he is actively seeking to sell the team. He has set a deadline of Friday for interested parties to submit “indicative offers” for the club he has owned for almost two decades, and is said to be seeking at least $2.5 billion for the club.

Only days ago, Abramovich, 55, had announced his intention to transfer the “stewardship and care” of Chelsea to members of its charitable foundation. The move — in which he notably did not suggest he would surrender ownership of Chelsea — was seemingly designed to distance the club from the impact of any possible sanctions levied by the British government against him as a result of the Russian invasion of Ukraine.

Britain this week proposed new legislation targeting wealthy Russians like Abramovich, many of whom amassed their fortunes through cronyism or ties to Russia’s president, Vladimir V. Putin, and then shielded it overseas behind shell companies and opaque investment deals.