Scottish police and prosecutors will hold talks with Foreign Office officials over Libyan defector Moussa Koussa.
They made a formal request to speak to the Libyan as part of their ongoing investigation into the Lockerbie bombing after he arrived in the UK last week.
The Libyan minister could be quizzed over the 1988 atrocity which claimed 270 lives.
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On Saturday Foreign Secretary William Hague signalled that police would be allowed to interview Koussa about Lockerbie and other historic crimes, saying: "We want more information about past events."
"The Crown Office in Scotland want to talk to him about what has happened in the past, such as Lockerbie. My officials are discussing with the Crown Office tomorrow how to go about that."
Koussa was head of Colonel Gaddafi's feared intelligence agency from 1994 and was a senior intelligence agent at the time of the December 1988 Lockerbie bombing.
He is believed to have played a key role in securing the release of the only man convicted over the incident, Abdelbaset al-Megrahi.
The inquiry into the bombing has remained open.
The Boeing 747 jumbo jet was en route from London to New York when it was blown out of the sky over the Dumfriesshire town.
Some 243 passengers, 16 crew and 11 residents of the town were killed and debris from the aircraft was spread over 1,360 square kilometres between Lockerbie and the North Sea.
Megrahi was convicted at Camp Zeist in the Netherlands in 2001 but released from jail in August 2009 on compassionate grounds after the Scottish Government was told he had only three months to live.
