The popular competition previously secured high profile names while at the BBC, including Geri Halliwell, Dame Edna Everage and Samantha Cameron.
TV sources are reportedly putting the struggle down to the controversy surrounding the show’s move to Channel 4.
The broadcaster is said to be still searching for A-listers to appear on The Great Sport Relief Bake Off 2017 for their Stand Up To Cancer charity episodes.
An unknown insider reportedly told the Sun: “They are terrified that they’ll be forced to cast C-list dregs from reality shows at this rate.
“It has come as a bit of a shock as the previous standard for celebrity specials was really high, with prestigious politicians, pop stars and even Hollywood names desperate to show off their baking prowess.”
The news comes after a fan-favourite left the Bake Off tent in last night’s dramatic episode.
Liam Charles won over viewers with his unique brand of humour in this year’s series, but his luck finally ran out with a trio of difficult “forgotten” British bakes.
The 19-year-old continued to wow judges Paul Hollywood and Prue Leith during the first round after making an impressive selection of Bedfordshire clangers.
But the quarter-final fell apart for the student when his Rum Nicky lattice was disappointingly raw.
His spun sugar on his Savoy cake showstopper also dissolved in a heartbreaking moment before it was presented to the unforgiving judges.
Express.co.uk has contacted Love Productions for comment regarding these reports.
The Great British Bake Off continues next Tuesday on Channel 4 at 8pm.