Arsenal CEO Vinai Venkatesham is set to leave the club before the next summer transfer window.
The club's most important decision maker has spent the past 14 years with the Gunners.
Venkatesham announced his decision through the club's website, although no reason was given.
Per the club website, Vinai said: This was a tough decision, but it is time to pursue another challenge. Now is not the time for goodbyes as I remain focused until my last day and supporting a seamless transition."
The club's Co-Chair Josh Kroenke commented: The Board is fully supportive of Vinai's desire to pursue his next challenge. Whilst it is business as usual with everyone focused on the season ahead, we'd like to take this moment to thank him for his contribution and long service. Vinai will always be part of the Arsenal family and always welcome back at Emirates Stadium.
Change and succession is something the club is well prepared for. The Board remains committed to our strategy and will address leadership change as we continue to drive the club forward."