Dermot O'Leary thinks 'The X Factor' needs to "up its game" now Simon Cowell and Cheryl Cole have quit.
The 37-year-old host thinks no-one will be able to replicate the pair - who have quit the ITV1 show to launch the series in the US - and he feels "disconcerted" after having singed up to continue his role as presenter without knowing who would be on the judging panel.
Dermot said: "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's disconcerting because I singed up to host the show this year not knowing who the new judges would be so it will be a challenge not having Simon there week in, week out. Whenever I have a problem or a question, I got o him. Now I'll have to figure it out for myself. We all have to work a little 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."
Dermot - who was shortlisted for the prestigious job of host on the US 'X Factor' - admitted he is thrilled Cheryl has landed a highly-coveted role on the judging panel, and while he is "gutted" not to have been included himself, he feels lucky to be on the UK show.
He added to the Daily Mirror newspaper: "I'm so happy for Cheryl doing the US 'X Factor'. She will be great but we're going to miss her here. I was gutted I missed out on the US 'X Factor' myself. But they told me I was the only Brit to be shortlisted to host it so that was a big deal for me.
"I just feel incredibly lucky to have my job, as no one's job is safe. Besides, all that travelling back and forth over the Atlantic would have been tough."