La Gazzetta dello Sport says Milan are ready to sell Fikayo Tomori over the January market.
And Milan want to replace Tomori with Cristhian Mosquera.
The 20-year-old is said to be Milan's first choice in the hunt for a centre-back. However, the Spanish U21 international will only join if Tomori leaves.
Cash-strapped Valencia are asking around €25m for Mosquera.
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Cristhian Mosquera