Nainggolan is on a season-long deal with the Sardinians.
â€œWhy not? The impact he has on the squad is evident," Passetti told the reporters during an event in Milan. â€œHe is having a great season.
â€œWe will speak about his future in a little while. It has been a complicated operation, but a genius one by President [Tommaso] Giulini.
â€œMaybe we can keep him if we reach the Europa League."