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Marina Granovskaia is the silent force behind Chelsea's transfer business.

Born in Russia, she has spent the past 18 years working alongside Roman Abramovich in various roles but moved to London shortly after he bought Chelsea in 2003.

Her official title is director, though Granovskaia is more precisely in charge of player transactions—a role she has thrived in.

From the £50 million signing of Fernando Torres to the £60 million sale of Oscar, she has been the brains behind big-money headlines.

West Ham United's Karren Brady may be the most high-profile woman in English football, but Granovskaia is the most powerful.

When it comes to the transfer market, she's Chelsea's Special One.