Last Sunday he bagged a brace as Crotone defeated Benevento 4-1.
Nwankwo scored in the 66th minute to reduce the deficit but Florentina held on for the win.
Giacomo Bonaventura opened the scoring for Fiorentina in the 20th minute before Dusan Vlahovic made it 2-0 on 32 minutes.
It was Nwankwo’s seventh goal in 19 league appearances for his side so far this season.
He is currently Nigeria’s highest goal scorer in Europe’s top five leagues (Premier League, Laliga, Bundesliga, Serie A, Ligue 1).
Crotone remain bottom on 12 points in the league table after 19 games played.
By James Agberebi