La Gazzetta dello Sport reports that the Viola are keen on signing the 17-year-old in January.
Fiorentina are keen to bring in some fresh blood and coach Sinisa Mihajlovic sees the youngsters as an ideal signing.
Fioreninta are expected to make a move for Nastasic in the near future, but the defender is not expected to join the club before the end of the season.
