The midfielder has been linked with some of Europe's biggest clubs.
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And Kovacevic has revealed they rejected a major bid from Brighton over the summer for the youngster.
He said, "We rejected a €40 million offer from Brighton for Mouzakitis: this shows we firmly believe in this kid's potential and that he can still grow.
"He's 18 years old, but has the maturity of a thirty-something.
"We're talking about a gem, with extraordinary ball handling skills. Something extremely rare in Europe for players of his age."
