The boxer, who was a late entrant to the house, had previously claimed he had little chance of making the final five, but was informed that he was staying by Davina during the live show.
"What the fuck am I doing here man?" JJ asked the group.
Josie explained that he deserved to be in the final because he was a genuine guy. "You're a nice guy, you're quite fit, you're a proper gentleman," she told him.
Mario told the 23-year-old he should be pleased that he had stayed in over original housemates Steve, Corin and John James. "You should be proud man; you clashed against proper heavyweights and won," Mario declared.
Josie reassured JJ he had every right to be in the house and should be happy with what he had accomplished. "You're in the final of Big Brother - I'm just happy to be involved, me," she said.