The actor said a second film could be based on John Le Carre's novel Smiley's People.
Speaking to Total Film, Oldman said: "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."
He added: "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."
Oldman recently joined the cast of Child 44.
Set in the Soviet Union of the 1950s, the project is produced by Ridley Scott and Michael Schaefer.
The film follows a Soviet military police officer (Tom Hardy) who becomes a target of the government when investigating a series of child murders.
Oldman will play the head of the police who follows Hardy's character.