"He has not been released and he has (temporarily) been granted a leave like other inmates," Mohseni Eje'i told reporters in his weekly press conference in Tehran on Sunday.
He explained that the Judiciary had first agreed with a 3-day leave for Baqer Namazi due to his disease but extended it after his lawyer asked for another 3-day leave to continue his treatment.
"He has gone on a leave for overall 6 days but he has not been released," Mohseni Eje'i said.
He added that Namazi's ultimate release is no point of discussion.
Iran’s penal authorities granted a four-day leave on Sunday to Namazi because of his health conditions, Namazi’s American lawyer said.
The announcement by the lawyer, Jared Genser, raised speculation that the reprieve was a precursor to parole for Namazi, 81, but Mohseni Eje'i dismissed it.
Namazi’s son Siamak Namazi, 45, also a dual citizen, remains imprisoned too for spying and collaboration with the US government against Iran.