BROADCASTER Sean Moncrieff has warned celebrities making the transition from TV to radio that it's not as easy as it looks.
The Newstalk presenter hosted a string of TV programmes on RTE over the years, including The End, Good Grief Moncrieff and Don't Feed the Gondolas, as well as being the voice of The Restaurant before settling at the commercial radio station.
And the 52-year-old insisted that radio can prove a difficult medium to master.
His words come as Jennifer Maguire, Bernard O'Shea and former Westlife star Nicky Byrne are turning to the airwaves and taking on programmes at 2fm.
"The big difference between TV and radio is that TV is a lot more premeditated and you're all made up to look your best, while reading something off a monitor," he said.
"In radio it's easier to be found out if there's not a brain in your head, or if you have just nothing interesting to say.
"I'm not saying this is going to happen to Nicky Byrne, but it can happen that you're there and you realise that you actually are by yourself.
"Radio is basically a man or woman sitting in a room talking to themselves for two or three hours, and if you're not mad enough to do that and make it sound interesting to yourself, then you can be found out very quickly. Good luck to them."
Moncrieff is making a return to TV for the first time in more than eight years next month, at the helm of TV3's brand new quiz show Crossfire.
Moncrieff, who took a two-week holiday from Newstalk to film Crossfire, said he is open to taking on more TV work.
Crossfire begins on TV3 on Friday, March 28.