New Chelsea owner Todd Boehly will act as the interim sporting director at Stamford Bridge as he takes charge of the club's summer transfer dealings.
The American magnate has also been confirmed as the new chairman, following Bruce Buck's recent decision to step down and move into a senior advisory position.
Chelsea will also lose Marina Granovskaia who is stepping down from her directorship after almost two decades at Stamford Bridge.
The Russian-Canadian business executive rose to prominence as one of the toughest negotiators in football. Since 2014, she has worked as the chief executive and has delivered a number of high-profile transfers.
A statement from Chelsea read: "Boehly will operate as interim sporting director until the club names a full-time replacement, continuing the club's work towards its targets during the current transfer window.
"We thank Marina for her many years of excellent service to the club and wish her all the best in her future ventures."
Meanwhile, all of Boehly's consortium figureheads have been added to the club's board. The statement added: "As custodians of Chelsea FC, we now begin executing our long-term vision and plan for the club, creating an outstanding experience for its passionate, loyal fans, and continuing to challenge for top honours in line with Chelsea FC's dedicated history.
"Working together, side by side, we are firmly committed to winning, both on and off the pitch. For us, that effort has begun."
Clearlake Capital chiefs Behdad Eghbali and Jose Feliciano, who helped Boehly in his takeover bid, have been added to the new board.
Swiss billionaire Hansjorg Wyss, British tycoon Jonathan Goldstein, LA Dodgers co-owner Mark Walter, music industry supremo Barbara Charone and Tory peer Daniel Finkelstein have also been named.
"As the new era of the Boehly-Clearlake ownership begins, we are excited to build a championship organisation and grow Chelsea FC as a global platform," said Eghbali and Feliciano.
"We look forward to backing Thomas Tuchel, Emma Hayes and their teams, and will provide proactive, unbending support to make Chelsea's loyal fans and our partners proud."