The Las Palmas player joined the German club from Italian Serie A side AC Milan and played two full seasons plus half a third that was marred by controversies between him and Schalke 04.
Boateng returned to AC Milan in the  January transfer window where he played for the Serie A club till the end of the season.
Italian football website calciomercato.com reported Boateng says he is the greatest football player in the history of Schalke writing in their headline:
âBoateng: "I'm the greatest player in the history of Schalke, no-one is like me"
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The website in their story quoted and interview by German maginze Kicker with Boateng saying:
âI think I left my impression at Schalke; even today when you read about the club my name is still mentioned. There has never been a player at the club that has created as much interest as me; this is the impression Iâve left behind. Positive or negative, I always tried to do my best to help the team. I could not do anymoreâ
Kevin-Prince Boateng who was not pleased with the headline took to his Twitter page to debunk the claims tweeting:
âJust for the record never said anything like it!! Because I respect the big players of Schalke in the past!!â
Kevin-Prince Boateng and his Las Palmas team will begin their Spanish La Liga season with an away game against Valencia on Monday.