'The X Factor' has been losing out to the Beeb's 'Strictly Come Dancing' in the Saturday night ratings war with the dancing competition pulling in 2 million more viewers than ITV's singing contest.
Speaking at the Collar and Coats Gala Ball for Battersea Dog's and Cat's Home, Amanda said: "I think that he's probably disappointed, but if he's got any sense he'll get on his white horse and he'll come charging back next year and save it.
"I think Simon should come back to the UK. I just miss him. I want him to come home."
Meanwhile, Amanda has revealed she'd love to host a remake of 'Jim'll Fix It'
"A show where little children... can write in. I like making dreams come true, which is kind of what we do on Britain's Got Talent, but I'd like to do it so people can blow up chimneys and things like they used to."