The promising 20-year-old defender is set to undergo his medical with Milan, per Fabrizio Romano.
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It is believed that Premier League clubs were interested in Parisian born Diawara, so Milan moved quickly to get the deal over the line.
Diawara made 14 appearances last season for Troyes in France's Ligue 2, while he scored once in the Coupe de France.
He will now continue his development under new boss Ruben Amorim at the San Siro.