Krecjir has been in prison since 2013, accused of several charges including murder, attempted murder and fraud.
The media have been provided with a letter addressed to the Director of Public Prosecutions in the High Court in Johannesburg from Krejcir’s lawyer Eric Bryer.
It says he also seeks voluntary extradition in return.
It further states that Krejcir is prepared to turn State witness and undergo an extensive debriefing, as well as testify about his corrupt dealings with high profile people, including former head of the police's crime intelligence unit Richard Mdluli and head of detectives Vinesh Moonoo.