Published Friday, 09 May 2014
Rumours surfaced last year suggesting the Kick-Ass star was being considered for the lead role of Christian Grey, but the part initially went to Charlie Hunnam.
When he quit the project, Co Down actor Jamie Dornan was chosen as his replacement, but Taylor-Wood has now revealed Johnson has made it into the film.
However, she has not elaborated on his role.
The movie, which also stars Dakota Johnson as Anastasia Steele, is due to hit theatres next year.
The casting news comes just weeks after Taylor-Johnson told Nylon magazine he had no interest in playing Grey.
He stated: "I think it would have been the wrong kind of hype to bring toward us (as a couple). It would have been kind of funny that this character that all these women fancy - he's one in a million - and my wife picks her husband to play the part?"
He added: "I would love to have done something together again, but it wouldn't have been Fifty. We were both on the same page."
The pair met on the set of 2009 movie Nowhere Boy, in which Taylor-Johnson portrayed a young John Lennon.