The striker will be departing after eight years with the club.
He posted on Instagram: "After eight years, it's now time to say goodbye to my boyhood club. During these years I've experienced things that 12-year-old me could have only hoped for.
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"I was once a kid in the stands that used to watch the team every other week, and always dreamed of being able to put on that black and white shirt. I have been able to represent this unbelievable club from the academy level to the first Team, and to make my Premier League debut at St James Park is something that I will never forget.
"I would like to give a massive thank you to all my teammates, the coaches, and the staff members who have helped me along this journey."