Colin Firth has admitted that he was worried about taking on the role of Bill Haydon in Tinker, Tailor, Soldier, Spy.
The British star picked up his first Best actor Oscar earlier this year for his role in The King's Speech and the Tomas Alfredson directed thriller saw him return to the big screen.
But the actor reveals that he was a little intimidated when he walked on set for the first time.
Speaking to the Press Association the actor said: "I don't think any actor is so selfless to only luxuriate in ensemble work, but I was absolutely up for it."
"There's an initial moment when you walk on the set and think, 'Oh, I might be out of my league'."
Firth was part of an all star cast that included Gary Oldman, John Hurt, Mark Strong, Tom Hardy, Benedict Cumberbatch and Toby Jones.
Tinker, Tailor, Solider, Spy has been a huge critical success, as well as being #1 at the UK box office.
And Firth has completed work on the remake of Gambit and has The Railway Man in the pipeline.
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