US magnate Boehly, leader of a Clearlake Capital consortium, will buy the Premier League club for what will be a sports franchise record deal of PS4.25billion ($A7.5b).

Eighty-eight days after Roman Abramovich officially put the Blues up for sale, billionaire Boehly is poised to take over at the west London club in 48 hours.

"Chelsea confirm the agreement to sell the club to the Todd Boehly/Clearlake Capital consortium with the transaction expected to be completed on Monday," a short statement on Chelsea's website said.

Abramovich put the club up for sale on March 2, following Russia's invasion of Ukraine.

The 55-year-old was then sanctioned by the UK Government on March 10, with Downing Street claiming to have proven his links to Vladimir Putin.

The Russian-Israeli billionaire has owned Chelsea for 19 years, leading the Blues to 21 trophies and changing the face of English football forever.

Abramovich has reflected fondly on his stay in west London and is confident Boehly and the Clearlake Capital consortium can take the club in the right direction.

"It has been an honour of a lifetime to be a part of this club - I would like to thank all the club's past and current players, staff, and of course fans for these incredible years," Abramovich said in a statement on Chelsea's website.

"It has been nearly three months since I announced my intention to sell Chelsea FC. During this time, the team have worked hard to find the right custodian for Chelsea FC that would be best positioned to successfully lead the club into its next chapter.

"The ownership of this club comes with great responsibility. Since I came to Chelsea nearly 20 years ago, I have witnessed first-hand what this club can achieve.

"My goal has been to ensure that the next owner has a mindset that will enable success for the men's and women's team, as well as the will and drive to continue developing other key aspects of the club, such as the academy and the vital work of Chelsea Foundation.

"I am pleased this search has now come to a successful conclusion. As I hand over Chelsea to its new custodians, I would like to wish them the best of success, both on and off the pitch.

"I am proud that as a result of our joint successes, millions of people will now benefit from the new charitable foundation which is being established. This is the legacy which we have created together."

Chelsea's sale has required UK Government, European Union and Portuguese Government approval due to the sanctions imposed on Abramovich.

The proceeds of Chelsea's sale - expected to be PS2.5b ($A4.4b) - will be frozen in a UK bank account on completion of the sale.

The UK Government will then need to issue a further licence to allow those funds to be diverted to a new charitable foundation, to aid victims of the war in Ukraine.

The news was welcomed by Chelsea Supporters' Trust, who have held positive talks with Boehly in recent weeks.

"The Chelsea Supporters' Trust would like to congratulate the consortium led by Todd Boehly on the takeover of Chelsea FC," the fans group said in a statement.

"We wish you every success as the custodian of our club and look forward to a long, constructive and mutually beneficial relationship between you and Chelsea supporters."

Australian Associated Press