Jamie Laing's friends Andy Jordan, Sam Cussins and Stevie Johnson will join the E4 reality series.
The move is said to have been made in order to improve the show following the departures of Caggie Dunlop and Hugo Taylor and girlfriend Natalie Joel.
Richard Dinan's love interest Kimberley Garner will also not return for the next series, with his new girlfriend Rose Cochrane-Stack, 21, replacing her.
Sportsman Sam Cussins, 23, said: "I'm looking forward to joining the show and meeting the rest of the Made in Chelsea crowd. Being single, naturally I'll be looking to take a few ladies on a few dates - will certainly be interesting to see how that goes!"
Finally, the Eton-educated Stevie Johnson added: "I can't wait to mix up the dynamic of the current cast in the new series."
The Bachelor star Spencer Matthews will return for the show's upcoming fourth series.
Jamie Laing launched his first Candy Kittens sweet shop in London earlier this week.