Hassan started acting in roles in television before playing a minor role in the comedy The Calcium Kid. He later was cast in the role of the leader of a fictional football firm in The Football Factory. Further collaboration with Nick Love led to a lead role in The Business.
Hassan has also had a number of minor roles in other films, such as The Ferryman, Batman Begins, Cass and Eastern Promises.
He is set to star in the upcoming Charlie Creed Miles film, New Beginnings.