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The Sun says that the Gavin & Stacey star was spotted on a train learning lines for the show while en route to the set in Cardiff.
A show insider is quoted as saying: "We normally keep our guest stars under wraps but you can't hide a bloke like James.
"And now he's not coming to Wales for Gavin & Stacey anymore, it's pretty obvious why he is here. James loves coming to Wales. And it gives him a chance to meet up with Ruth Jones, who co-wrote Gavin and Stacey with him and starred as Nessa."
The source added: "We're just delighted to have James on board. He is a great actor and he'll be a perfect fit for the new Doctor Who."
This morning, show officials refused to confirm or deny the story, telling DS: "We do not comment on casting or storyline speculation."
> Tube Talk: The new 'Who' trailer in case you missed it
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