Ashleigh Hughes, Deana Uppal, Scott Mason and Adam Kelly are the foursome who may be booted out before the weekend.
This weekend's live show with Brian Dowling will feature a double eviction, so only two housemates can survive.
Luke Scrase was immune from eviction after winning a free pass to the final in last week's White Room task.
Luke Anderson and Sara McLean will also join Luke S in Monday (August 13) night's finale.
Becky Hannon and Conor McIntyre became the latest housemates to leave the show last week. Becky was voted out by the public, while Conor won £50,000 and walked during the White Room challenge.
Big Brother continues every night on Channel 5