Valladolid accept they face a battle to keep hold of Moro over the January market as interest arrives from across Europe.
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De Telegraaf says Ajax are making Moro a priority target for the winter transfer window.
Liverpool, Manchester City and Tottenham are also following him closely.
Valladolid would be prepared to sell for around €10m, which would be immediately put towards team strengthening for the second-half of the season.