Ananova:

Big Brother bosses are keeping a close eye on Lisa in case she hits another housemate.

The Mancunian, who threw a bycycle at Richard last week, has talked about hitting one of the other contestants.

According to The Sun an insider said: "She is always talking of 'doing things' to other housemates. This may be coming to a head as she is about to run out of cigarettes."

A show spokesman said: "Big Brother constantly watches all the housemates to ensure their safety."

Meanwhile, Nikki is up against Mikey, Imogen, and Lisa for eviction this week.

Only half of the house nominated after Glyn, Imogen, Lea, Lisa and Nikki were forced to nominate each other in front of all the housemates.

Nikki is favourite for the chop at 1/5 with Lisa next at 1/4.