The BBC announced that from May 10, Alex will feature alongside Jermaine on a Monday through to Wednesday, while Ronan will take the reins on Thursdays and Fridays.
Speaking of his new role on the programme, Jermaine said: “I’ve absolutely loved being a part of The One Show, Alex, the team and the viewers have made me feel so welcome and we’ve had a lot of fun already.
“I’m really looking forward to joining as a full-time host alongside Ronan.”
Ronan, who currently presents his own show on Magic Radio, added: “I’m so delighted to officially be a part of The One Show family.
“It’s a show I’ve loved for many years as both a guest and a host and I can’t wait to get started alongside Alex, Jermaine and the wonderful team behind the scenes.”