Sporting director Frank Arnesen has announced that he will leave Chelsea at the end of the season.
The 54-year-old former Denmark international has spent the last six years at Stamford Bridge, but has decided to resign with effect from the end of the current campaign.
Arnesen told the club's official website: "It has been a privilege and an honour for me to work for such a big club with so many great people.
"After six wonderful years I have decided to seek a new challenge when my contract expires at the end of this season.'
"It has been a tremendous journey and I would like to thank everyone at Chelsea, especially Roman Abramovich, for giving me the incredible opportunity to help build on the club's Academy and youth system along with our greatly talented academy and scouting staff.
"We are now seeing the fruits of that labour, as our stated aim was to get one player from the Academy into the first team each year from 2010.
"We have a great crop of young players now coming through and I feel it's the right time for me to start looking towards a new challenge.
"It is always difficult to take big decisions like this, but it is entirely my decision. I'm looking forward to continuing my work here until such time as the club decides which way they want to move forward."