The striker was signed in January 2018, under the brief Sam Allardyce tenure, making the move from Besiktas. The 30-year-old leaves the Blues after four-and-a-half years at Goodison Park, having made 61 appearances in all competitions, scoring 11 goals.
Tosun, an unused substitute against Arsenal, wrote on Instagram: "Dear Blue Family, I had a great four and a half years as a member of your family with ups and downs and now unfortunately it is time to say goodbye. I would like to thank my coaches, teammates, staff, board members, and the chairman I had worked with.
"I have nothing but love for this club! This club has so much potential and I am sure soon Everton will have better days and when the day comes I will be celebrating as well.
"Take care, Cenk Tosun."
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