Mark Francois has said he is "certain" a Brexiteer will become the next leader of the Conservative Party.
The European Research Group vice-chair made his predictions on the breakfast show, following the news that the Prime Minister has agreed to set out a timetable for her departure.
"I'm almost certain that a Brexiteer will win," he told talkRADIO's Julia Hartley-Brewer.
"Personally I'll vote for a Brexiteer. The ERG will not vote as a block for one candidate, it doesn't work like that, but I am almost certain most members of the ERG will vote for a Brexiteer."
Boris Johnson announced yesterday that he would run for Conservative leader, with rumours swirling that Dominic Raab may also follow suit.
"The problem is that the Tory Party knows Boris too well and it doesn't really know Dominic Raab at all, so we have got further to go on this," Mr Francois said.
And when asked whether Johnson had a strong chance of winning, the MP for Rayleigh and Wickford added: "It might well happen."
Esther McVey revealed to talkRADIO last week that she would be running for leader, with Andrea Leadsom and Rory Stewart also announcing their ambitions to take on the role.
"I put a tenner on myself at William Hill a month ago and I got 200 to 1, which I was flatterd by," Mr Francois joked. "And a couple of other friends have put a tenner on or so."