Gary Oldman has revealed the Tinker, Tailor, Soldier, Spy sequel is still "on the cards".
There had been talk of making a follow-up following the success of the 2011 espionage film, which is based on John Le Carre's spy novel. Shooting on the film - tipped to be based on the book Smiley's People - had been expected to begin in 2014, although nothing has been officially confirmed.
Gary, who played MI6 agent George Smiley, told Total Film: "I loved playing George in Tinker, Tailor, Soldier, Spy. It's on the cards and I know John Le Carre is very keen to do Smiley's People.
"It could be a five, even a 10-year break - the years pass between the middle book (The Honourable Schoolboy) and the last one (Smiley's People) anyway.
"But we'll do one, I hope. I miss him. I love George," the actor added.
Producer Eric Fellner previously said that the next instalment is in the works.
"We are working on another one. [Producer] Tim Bevan is putting it together as we speak with [screenwriter] Peter Straughan and [director] Tomas Alfredson, so yes it's in development," he told Collider in December 2012.
"Tinker did unbelievably well and it didn't cost hardly anything... But things take time. Tim is passionate about making sure we do another one."