Gourlay said on Wednesday he was leaving Stamford Bridge after a decade in which Chelsea were crowned kings of Europe but also suffered plenty of off-field dramas too.
Earlier, media reports quoted Gourlay as saying talks were "ongoing" over a new deal between the midfielder and the club.
Drogba, who scored the decisive penalty to defeat Bayern Munich in the shoot-out of the Champions League final on Saturday, is out of contract next month.
Meanwhile, Real will play Cyprus' APOEL; Chelsea face Portuguese side Benfica and Bayern will take on Marseille.
Guus Hiddink has been heavily linked with a move to succeed the Carlo Ancelotti, who was fired after a trophyless season.
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