They will be up for the public vote before Friday's live show.
But Ben, Dave, Govan and Shabby will have a chance to escape eviction when they compete against each other in a task later on.
The winner will become exempt from the public vote and will have to choose another housemate to take their place.
Last week, Rachael became the first contestant to leave after Dave won the Cheese Task and chose to put Rachael up for eviction.
See the housemates nominate on Channel 4 tonight at 10pm.
Where to next?
- Big Brother 2010: last night's action
- See all this year's housemates and wannabes
- Latest celebrity pics