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Chelsea's English midfielder Conor Gallagher. [AFP]

Chelsea manager Enzo Maresca said financial sustainability rules must be changed to discourage clubs from cashing in on academy graduates as Conor Gallagher looks set to join Atletico Madrid.

The England international would join Mason Mount, Lewis Hall, Ruben Loftus-Cheek, Ian Maatsen and Callum Hudson-Odoi as products of the Chelsea youth system to be sold over the past two years, while Armando Broja and Trevoh Chalobah are also expected to leave before the end of August.

Chelsea have needed to recoup funds after splashing well over £1 billion ($1.3 billion) in the past four transfer windows to revamp the squad under new ownership led by LA Dodgers co-owner Todd Boehly and private equity firm Clearlake Capital.

The sale of players who came through the academy is particularly helpful for clubs to comply with financial regulations as the full transfer fee is recorded as a profit in the books.

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