He has also appeared in Layer Cake (2004), Batman Begins (2005), The Business (2005), Kick-Ass (2010), The Hooligan Factory (2014), Game of Thrones (2016) and Snatch (2017–2018).

[4] The film's director Nick Love subsequently cast him in the primary supporting role for The Business.

[5] Hassan has had roles in films including The Ferryman,[5] Batman Begins,[5] Cass,[5] Eastern Promises,[5] and Clash of the Titans,[5] in which he portrayed Ares, the ancient Greek god of war.

In 2011, he played "The Boss", a shady police officer, in the British film noir Jack Falls.

[6] Hassan is married and has two children: a son who is a professional football player,[7] and a daughter, Belle, who appeared in the fifth series of Love Island in 2019.