The Belgium international's two goals could not rescue the result for Antonio Conte's men, who were three goals down at half-time in their ICC clash.
The Bianconeri are ready to pay €90 million for the Napoli striker, who represents the missing link in their pursuit of Champions League glory.
Italian giants Roma have had their defence ravaged by injuries and are understandably hesitant to let the in-demand Greek international leave the club.
The Argentina star had been slated to play alongside several ex-Blaugrana team-mates in a charity match, but his club have confirmed that he is not in the country.
The Spanish side managed to keep their opponents at bay to grab the point necessary for qualification, although they were made to suffer with a series of close calls.