Big Brother contestant Makosi Musambasi says she has been given notice by immigration officials to quit the UK.
Makosi Musambasi came third in the Channel 4 reality show
The 24-year-old from Zimbabwe said her working visa had been curtailed after she left her job as a cardiac nurse to appear on the reality show.
Ms Musambasi has 10 days to lodge an appeal. If it fails, she must leave the country or face being deported.
The issue came to light after police stopped her for not wearing a seatbelt as a passenger in a car.
Immigration officials questioned her on Monday over whether she had broken the terms of her visa.
Ms Musambasi was previously granted a working visa for her job as a cardiac nurse at Wycombe Hospital, Bucks.
Her spokesman said: "The legal position is that Makosi's working visa has now been curtailed, which means she has to either leave the country or appeal."
He added that Ms Musambasi consulted an immigration lawyer as soon as she left the Big Brother house.
Ms Musambasi, of High Wycombe, Buckinghamshire, was quizzed at Staines police station in Middlesex after she was pulled over on the M25 in Surrey while travelling as a passenger in her sister's car.
A spokesman for Surrey Police said: "Police stopped a car on the M25 near Stoke D'Abernon at 5pm yesterday on a driving matter.
"A 24-year-old Zimbabwean was then questioned by the immigration services which is now dealing with the matter."
Ms Musambasi came third in the reality show behind Anthony Hutton and Eugene Sully earlier this month.
Her sister, Veronica, said Ms Musambasi entered the show in the hope of flying their mother to South Africa for a life-saving operation on a tumour behind her eye.