The pair will take turns at 'Fill Your Face Extreme', which will see their heads enclosed in perspex helmets filled with creatures including spiders, crabs and snakes.
The winner gets to return to camp, while their opponent will leave the jungle for good.
They were the bottom two in the latest public vote. Pat had the least support from the public, but it was close, with only 331 votes seperating him and Fatima.
The results will be revealed in tomorrow's show at 9.00pm on ITV1, which will also feature an interview with the loser.