UK murder suspect Ndodana Mkhanyisi Tshuma will appear at the Johannesburg Magistrate's Court in Johannesburg on Monday following his arrest in Kensington last week.

The South African Police Service (SAPS) says a British citizen of Zimbabwean heritage wanted by authorities in the United Kingdom for the alleged murders of his wife and two young daughters was found in possession of an illegal firearm following his arrest in Johannesburg last week.

SAPS national spokesperson Brigadier Athlenda Mathe disclosed the Johannesburg Magistrate's Court on Monday, where 45-year-old Ndodana Mkhanyisi Tshuma was due to make his first court appearance.

Mathe said Tshuma would appear before the court on two separate matters: extradition proceedings to the UK and a charge of possessing an illegal firearm in South Africa.

"Tshuma will make his first court appearance this morning on two separate matters. The first one being the extradition matter," she said.