Roberto's show from 1 - 4pm will be filled by The Bassman, whose late-night programme from 10pm - 2am will be taken over by Dave Kelly, who moves to Capital from Galaxy Radio.
Margherita Taylor will continue with Capital at weekends and focus on her daily show on Classic FM from 6pm till 9pm.
This follows an earlier re-shuffle in May, when Rich Clarke and Kat Shoob joined the weekday 7-10pm show, among other changes.
Register for a Music Week trial to access this article.
Sign up for your digital free trial to Music Week, the no 1 weekly trade magazine for anyone who needs to understand the business of music. For four whole weeks we will provide you with great, in-depth journalism that gets right inside the business of music.Start your free trial