The actress has played Clara Oswald since the beginning of series seven, but, according to the Daily Mirror, she could be preparing to leave the BBC show, which is due to relaunch later this month with Peter Capaldi as the series eight Time Lord.
Before the rumours emerged, Jenna told The Independent: “When I’m here in Cardiff, it’s me and Peter, all day, every day. It’s one of those jobs that will only happen once – the whole adventure that it brings. The key is not to worry about the future, and enjoy it.”
A source told the Mirror: “The conversations about Jenna’s exit have started, and a plan is in place which is being ironed out.
“By the time she leaves she will be one of the longest-standing companions ever. She has been absolutely brilliant in the role, but everyone agrees it is a part that should change after a period.”
The source added: “It was very much a mutual decision.
“It’s important to keep the series moving and fast-paced, and the time is just starting to feel right and the feeling is that it could be a perfect Christmas storyline.”