He makes his debut the week of Monday 14th April covering for seven days.
Jonny said, "I'm delighted to join the UK's biggest and best station to do my favourite job at the best time of day."
"It's also one of the most exciting weeks in the sporting calendar with the Masters winner and Liverpool's result against Manchester City battling for top story in my first bulletin on Monday morning!"
Jonny's on with Zoe Ball, who is standing in for Chris Evans.
His unique style of sports bulletin was most recently heard on Smooth Radio breakfast, where he presented the sport each morning for two years, alongside Simon Bates.