George R R Martin has signed a contract with HBO and four writers to prolong Game of Thrones with some spin-offs.
A spokeswoman for HBO said: "We'll take as much or as little time as the writers need and, as with all our development, we will evaluate what we have when the scripts are in."
One of the four writers up to extend the show is Jane Goldman, who co-wrote the superhero flick Kick-Ass.
Mad Men writer Carly Wray, Brian Helgeland (LA Confidential) and Max Borenstein (Kong: Skull Island) are the other three on board.