GAME of Thrones star Rose Leslie may soon be stepping out of the Tardis after being named bookies' favourite to become the next Doctor Who companion.

It has been reported that Jenna-Louise Coleman, who plays Clara Oswald, will leave the hit BBC show at Christmas and, according to Ladbrokes, Leslie, 27, is favourite to replace her, with odds of 14/1.

The BBC has refused to comment on rumours of Coleman's departure, saying people will have to watch the new series to see if she will return or not.

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Leslie would join fellow Scots Peter Capaldi and show runner Steven Moffat on the show if she won the role. Other Game of Thrones stars touted for the part include Alfie Allen, Jack Gleeson and Maisie Williams with odds of 20/1.

Odds of 16/1 are also being offered on Karen Gillan returning to the show, while the same odds are given for Chris Addison taking on the role.