Chelsea have revealed that Peter Kenyon is to leave his role as chief executive at the end of October.
Kenyon, who arrived at Stamford Bridge from Premier League rivals Manchester United in 2004, will continue to be a non-executive director at the club and represent them on various UEFA committees.
"I am extremely proud of my time at Chelsea and of the friendships I have forged with everyone here," he told the club's official website.
"I have been in football for 15 years and I can say with great certainty and pleasure the experience at Chelsea is one of the best I have had.
"When I joined Chelsea it was an incredible challenge and together with all the staff, the players, the board and (owner) Roman (Abramovich), I think we have really built a club, in a relatively short space of time, that can be in the forefront of European football for many years to come. That is a major achievement.
"I intend to take a little time off before considering what I do next but I am certain I have at least one major challenge left in me."
"I would like to wish Chelsea the best of luck for the rest of the season. I am sure (manager) Carlo (Ancelotti) can lead the team to more great things."