The Dutch youngster is being tracked by Europe's biggest clubs, including Real Madrid and Barcelona.
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The Daily Mail says Newcastle want to bring Smit to England during the January market.
AZ rate Smit in the €60m class, though Newcastle are reluctant to go higher than €40m for the youngster.
As such, Newcastle are also monitoring alternatives in Auxerre's Kévin Danois and Feyenoord's Luciano Valente.