Don't think Mancini rates him and he will be gone by the end of summer, while he still has some value. He was not a Mancini player and Mancini does not like one dimensional players, especially in midfield. Need at least two dimensions, preferably three.
For NDJ's position, the player needs to be an accurate passer, mobile and good under pressure, and a strong defender, able to get behind the ball and defend. NDJ has one, posibly two of those attributes. I think it is fairly clear from the way he uses Yaya, Barry and Milner that NDJ is just not in the same class, and I would venture that the TYPE of DM he is does not gel with Mancini's future vision.