His rumoured appearance comes as his niece remains out of the public eye following major surgery, with royal watchers fearful his presence could cause her upset.
A source told the The Sun: “Gary said he’s been read the riot act by Kate’s mum Carole and her dad Michael – they aren’t happy he’s going into Celebrity Big Brother. It is infuriating for them. Kate doesn’t need this stress.”
Speaking to the newspaper in January, Angela Levin, a royal author and biographer, said: “I think it’s cringe-making, very embarrassing, the trouble is he doesn’t like Harry and Meghan at all, some of this comments will fall onto Catherine and she’s had a lot against her, she’s not well.
“I think when you come out of an operation you’re quite vulnerable and this could upset her enormously. In principle people who don’t like her could say she encouraged him to do it, but she would have done nothing of the kind. It’s very embarrassing.”
On Friday, Kensington Palace reassured the public that the Princess of Wales is still “doing well” as she recovers from abdominal surgery.
The palace has reiterated that “nothing has changed” since an original statement in January, which gave some details of the Princess’s procedure and recovery period.