Children's TV presenters Dick and Dom are to leave Radio 1, just a year after joining the station.
A new weekend breakfast show has also been announced in the second round of high profile schedule changes in a week.
From September, Nihal will present the Saturday and Sunday afternoon show while Nick Grimshaw takes over the weekend breakfast show.
Sara Cox and Edith Bowman both return in September, following their maternity leave. Cox will cover Jo Whiley's mid-morning show during Whiley's maternity leave and from the new year host Sunday mid-mornings.
Edith Bowman presents the Sunday morning show in September and October and returns to her regular weekday show in November.
Dick and Dom, who have hosted Sundays for the past year, will leave the station in September to "pursue other projects", according to the BBC.
Ben Cooper, Head of Programmes, Radio 1, said: "Nihal and Nick Grimshaw have already proved themselves in their current slots and I'm really excited about what they can achieve with their new shows.
"We are also saying goodbye to Dick and Dom and I want to wish them all the very best and say thanks for their work at Radio 1."
