The Croatia international is being tracked by Arsenal and Inter Milan ahead of the January market.
But Nikky Vuksan told TMW: "You have not seen the best of Sime, he's just arrived in Serie A and is still getting used to this football. He has a great character and will be successful.
"A big club move? He is happy with his life and work in Genoa. He's only thinking of this."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball