Ademola Lookman is set to face punishment from Atalanta after failing to attend training this week.
The Nigerian forward is reportedly keen on a move to Inter Milan this summer and has already left Italy.
Reports from Football Italia say Atalanta have prepared legal measures and a heavy fine over what the club views as unacceptable behaviour.
Inter are expected to return with a higher offer for Lookman after their initial bid was turned down last week.