Yeah, the UK even has Unexplained Wealth Orders specifically to combat money laundering and dirty money in general. [1]
If it's legit money, sure.
FYI:
https://www.standard.co.uk/sport/football/chelsea-fc-roman-a...
https://www.reuters.com/article/us-chelsea-abramovich-book-i...
It's of course possible that Abramovich got his riches by illegal means. Nevertheless buying a football club seems like a normal thing to do (for rich people).
I don’t think his purchase would work today
> An unexplained wealth order (UWO) is a type of court order issued by a British court to compel the target to reveal the sources of their unexplained wealth. UWOs were introduced by sections 1–2 of the Criminal Finances Act 2017
> In June 2003, Abramovich became the owner of the companies that control Chelsea Football Club in West London.
Both from Wikipedia