Pictures early on Monday showed Silva, often described as the "the new Cristiano Ronaldo", on his way to undergo a medical.
Television pictures early on Monday showed Silva, often described as the "the new Cristiano Ronaldo", on his way to undergo a medical in Milan.
The 21-year-old striker was a reported target for a number of top European clubs.
But after Milan failed in bids to land Andrea Belotti from Torino and Pierre-Emerick Aubameyang from Borussia Dortmund, Silva is now expected to sign for the seven-time European champions.
He would become their fourth recruit in as many weeks following the signing of Swiss left-back Ricardo Rodriguez (Wolfsburg), Ivorian Franck Kessie (Atalanta) and Argentinian centre-back Mateo Musaccio.
Milan were recently sold to Chinese investors by long-time club owner Silvio Berlusconi in a bid to inject fresh impetus into their attempt to rejoin the elite of European football.