Former South African President Nelson Mandela is showing ``great improvement,'' his ex-wife, Winnie Madikizela-Mandela said Friday.

Reuters is reporting that Madikizela-Mandela spoke to reporters outside Mandela's former home in the Johannesburg township of Soweto.

``I'm not a doctor but I can say that from what he was a few days ago there is great improvement,'' she said.  

Meanwhile members of Mandela's family as well as South African Cabinet ministers have visited the hospital where the 94-year-old former president is critically ill.

One of Mandela's daughters, Makaziwe Mandela, was among family members who arrived at the Pretoria hospital on Friday. The ministers of health and defense also visited, the South African Press Association reported.

The anti-apartheid leader was taken to the hospital on June 8 to be treated for what the government said was a recurring lung infection. South Africans have held prayers nationwide, and many have left flowers and messages of support outside the hospital as well as his home in Johannesburg.

On Thursday, the office of South African President Jacob Zuma said Mandela's health had improved overnight, and that his condition was critical but stable.

The Associated Press contributed to this report.