Andrew Tate and his brother Tristan will stay in custody until 27 February after a Romanian court extended their police detention.
The pair are being investigated over allegations of sexual assault and exploitation.
A a judge has decided they remain in prison for a further 30 days while police investigate.
The self-proclaimed misogynist was arrested in Bucharest on 29 December on charges of being part of an organised crime group, human trafficking and rape.
His brother Tristan and two Romanian women were also taken into custody. All deny the charges.