Posting on LinkedIn, Watson wrote: “After 13 years at the club, I have decided to move on to the next chapter.
“I will leave my position in February to start a new and innovative company which will approach things differently and I’m confident will have a great impact on our industry.
“I would like to thank Arsenal FC for the amazing opportunities they have provided me, for which I will be forever grateful.
“I leave behind a fantastic team and indeed some of my closest friends, all of whom have had such a positive influence on my life.
“I’m very excited for what the future holds, watch this space…”