He made guest appearances in multiple British TV shows, including Silent Witness, Law & Order: UK, Casualty, Strike Back, Luther, Getting On and Lewis.
In 2013, he appeared in the Nigerian film, Half of a Yellow Sun, alongside Thandiwe Newton, Chiwetel Ejiofor and another rising star, John Boyega.
[4] He also appeared in the thriller Eye in the Sky (2015)[5] and the British action comedy Free Fire (2016), set in Boston, and starring Brie Larson, Sharlto Copley and Armie Hammer.
He made a return to television with a major role in the Channel 4 drama National Treasure as Jerome Sharp, the lawyer of Paul Finchley, played by Robbie Coltrane.
In 2020, Ceesay was cast as DI Jackson Mendy in the Alibi television series We Hunt Together, with Eve Myles, Hermione Corfield and Dipo Ola in the other main roles.