He told the Daily Mail’s Weekend magazine: “James Middleton and I are working on something together at the moment.
“I can’t give too much away but it’s about travel, adventure and food.
“There are some very cool ideas that haven’t been done before – one of them is in America. I’m quite close to achieving that, and the hope is that we make it into a returnable series.”
Matthews, 30, will join other famous faces including The Saturdays’ singer Frankie Bridge and The Only Way Is Essex’s Gemma Collins on the next series of BBC One’s Celebrity MasterChef.
He is married to Irish model Vogue Williams and they are expecting their first child, a boy, in the next few weeks.