Colin Firth may return for a sequel to 'Kingsman: The Secret Service'.

The 54-year-old star appeared unlikely to return for the much-anticipated sequel after his on-screen character, Harry, was shot by Valentine - played by Samuel L Jackson - in the first movie, but director Matthew Vaughn suggested he could return for the next movie.

He said: ''A lot of people are very upset that Colin might not be in the sequel. But I'm coming up with ideas at the moment.

''If people buy tickets in America, I've got a feeling we'll figure out a way for having Colin back.''

Vaughn also previewed other aspects of the sequel, suggesting Eggsy - played by Taron Egerton - will remain a key character in the next movie.

He told USA Today: ''The sequel will be, 'This is the modern-day gentleman spy'. Because Harry isn't.

''Harry even says, 'There is a reason why we've developed weak chins'. He said that, meaning, 'Look at us, we need to get new blood into this system', and that's what Eggsy is.

''I joke that we've made the prequel to the Eggsy movie.''

'Kingsman: The Secret Service' is out now in cinemas.