Dermot O'Leary has admitted it's going to be a "challenge" hosting The X Factor without Simon Cowell - and that he'll miss judge Cheryl Cole.
The host told the Daily Mirror that it would be a "different show" without Simon and Cheryl, who is favourite to land a job on the US X Factor.
He reportedly told the newspaper: "We will miss them. We will have to up our game now. It will be a different show. Whoever they bring in, no-one can replicate Simon. There will only ever be one real Mr Nasty. He is a force of nature, he's our boss.
"It will be a challenge not having Simon there week in, week out. Whenever I have a problem or a question, I go to him. Now I'll have to figure it out for myself. We all have to work a little bit harder.
"I signed early but you have faith in the show - it's the biggest in the country. I'd be the biggest idiot not to do it. It feels like home."
ITV recently confirmed that Simon would not have a weekly judging role when the UK version of the show returns in August. The first series of X Factor in the US is due to begin in September.
Dermot's comments come as Simon said he thinks US viewers will take Cheryl to their hearts on the US X Factor - and that bosses have been "desperate" to sign her.
Although the deal is yet to be finalised, Simon told Deadline he wanted her on the panel along with Paula Abdul.