Howard is due to star in ‘Winnie,’ a film about the relationship between Mandela and his ex-wife, played by Jennifer Hudson.
The film was shot in 2011 but shelved. Howard told GQ the decision not to air the film when it was due to be shown ‘broke his heart’.
He added he felt the pressure to step up to the mark to portray Mandela in the film.
He said: ‘If you fail at Nelson, you don’t get to comeback and say, ‘Well, I was trying. Let me do it again.’ There are no re-takes. I knew that it would either kill my career or give birth to it.’