The model, who has not been named, was assaulted, drugged, handcuffed and stuck in a travel bag, police said in a statement.
A 30-year-old Polish national who resides in the United Kingdom was arrested on kidnapping charges. Lukasz Herba was arrested July 17 outside the British consulate in Milan while accompanying the woman, said Lorenzo Bucossi, the head of the Milan Police Mobile Command unit.
It was not immediately clear why the suspect took the model to the consulate.