The Bulgarian government has released Australian Jock Palfreeman, who was convicted of murder in 2009, from an immigration detention centre more than three weeks after the court granted him parole.

Palfreeman is not allowed to leave the country, but his release has still sparked political controversy in Bulgaria and abroad.

Australian Foreign Affairs Minister Marise Payne has said she is pleased that Palfreeman has been released from detention, but has expressed her concern that he is being denied the right to return back to Australia.