From what I have read, the Italian authorities investigated his alleged mum and dad. They dna'd them and then Diallo and his alleged brother. It showed they are not family, not even his brother, in anyway. (people trafficking?) they are prosecuting the adults but Diallo and the other brother were under age at the time he came into Italy so they are not prosecuting him for that, BUT he registered to play for Atalanta using the forged documents, so they fined him. They have decided not to deport him so presumably he now has an Italian passport.
It also leaves the Rags free to sign him.
In other news Fred is being investigated for claiming on official forms he is a footballer.