Drummy was with the west London club between 2007 and 2014 as a academy coach and reserve team manager.
He guided the Blues academy to their first FA Youth Cup success in 49 years, with a 3-2 aggregate win over Aston Villa academy in 2010.
And the 24-year-old defender who is currently on a season-long loan at Kasimpasa from the Stamford Bridge outfit, expressed shock at the demise of the Englishman.
