The Oscar winner appeared in 2001 comedy Bridget Jones's Diary opposite Renee Zellweger and Hugh Grant, and they all returned for a 2004 follow-up Bridget Jones: The Edge of Reason.
Movie bosses are now working on bringing a third film to the big screen in 2014, but Firth has revealed the project has been hit with a raft of delays.
He tells the Chicago Sun-Times, "Unfortunately, it might be a bit of a long wait. I wouldn't say that it's completely dead in the water, but the way it's going you might be seeing Bridget Jones' granddaughter's story being told by the time we get there..
READ MORE: http://www.express.co.uk/news/showbiz/394468/Colin-Firth-fears-for-Bridget-Jones-sequel