The 19 year-old attracted enquiries from Real Madrid and Barcelona over the summer, with Smit acknowledging their interest at the time.
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The Daily Mail says along with the LaLiga interest, Premier League clubs are also watching the youngster this season.
Specifically Chelsea and Manchester United are scouting Smit, along with FA Cup holders Crystal Palace.
Indeed, it's suggested Palace are currently the most keen and have asked AZ about a price for the player. It's claimed AZ would be willing to part with Smit in January for €20m.