Kinga Karolczak, who narrowly failed to win a place in the Big Brother house a month ago, has been parachuted into the show to replace Orlaith McAllister.
Makosi said Kinga Karolczak "couldn't face the harshness of the house"
Orlaith walked out on Saturday after being saved from eviction when Kemal Shahin was booted out on Friday.
Kinga, 20, was one of a trio of new hopefuls put into a secret room in the house in June.
Makosi Musambasi chose to take Orlaith and Eugene Sully with her into the main house - and leave Kinga behind.
At the time, Makosi said she thought Kinga "couldn't face the harshness of the house".
But she now has her chance to take part in the Channel 4 reality TV show and is eligible to win or be evicted, like the other contestants.
Kinga joined the five remaining housemates - Makosi, Eugene, Anthony Hutton, Derek Laud and Craig Coates.
Orlaith left saying she "couldn't stand being in the house another week" with Derek.
Anthony is odds-on favourite to win the show, followed by Eugene and Makosi, with Kinga installed as 12/1 fourth favourite by bookmakers Ladbrokes.