The Croatian is reported to be an £18million target for Arsenal in the transfer window with Chelsea also understood to be keeping tabs.
Last week, manager Roberto Mancini publicly stated his intention not to sell the 23-year-old.
But Brozovic's agent Miroslav Bicanic has talked up the possibility of leaving Italy, claiming "he's not cheap".
He told Italian website Calciomercato: "Now he's at the top. This is seen also by other clubs, Spanish and English.Â
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"The Premier League clubs know him very well, and believe he can improve a lot in the next few years, but they also know that he's not cheap.Â
"Marcelo is happy at Inter, playing well, the fans love him, everyone at the club believes in him, Milan is fantastic. So we think of a transfer only when Inter will give the green light.Â
"Prior to that he is focused only on Inter matches and how to achieve the best possible results this season."