It comes as footage has emerged of Thomas Tuchel pushing Liverpool captain Jordan Henderson ahead of the FA Cup final.
Government sources reportedly fear Chelsea's takeover could be "timed out by certain sporting deadlines" and that Roman Abramovich "is ultimately willing to let the club go under".
What did you think of Chelsea's FA Cup final performance against Liverpool ?
Chelsea manager Thomas Tuchel was seen on camera jokingly pushing Liverpool's Jordan Henderson before the FA Cup final.
Reports had suggested Chelsea boss Thomas Tuchel held an interest in signing the deadly goalscorer, although Lewandowski himself is reported to prefer a move to Barcelona.
The Polish striker has been linked with leaving German outfit Bayern Munich his summer with his contract at the Allianz Arena is due to expire next summer.
The billionaire put the club up for sale following his native country Russia's invasion of Ukraine before he was sanctioned by the UK government over his alleged links to Vladimir Putin.
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