The Bologna striker has been linked with a move to Inter.
Zanetti said: "Zirkzee is a great champion.
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"We are talking about a young, talented, intelligent, physically very strong player. Someone like that would be useful to any great team aiming for important goals. If an important opportunity presents itself, maybe we can think about it.
"Zirkzee, Lautaro and Thuram are three young, strong strikers who give you peace of mind."