The Jack & Sarah star is now the latest big name rumoured to have joined the cast of the upcoming sixth series after his work experience listing on his ARG Talent agency page was updated to include Game of Thrones as his most recent project.

A screenshot of the posting has appeared online, but the original listing has now been removed from the talent agency's website.

Grant has yet to comment on the news, but if it is true, he will become the latest big name British star to join the Game of Thrones cast, following in the footsteps of Ian McShane, who is to make an appearance in season six.