Nottingham Forest have been following Moro this season, but now face major competition ahead of the January market.
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Sport says Moro's form in a struggling Valladolid team has brought him to the attention to bigger clubs.
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.