Mr Ghanem may be happier, however, in his new post as energy boss.
The denials uttered by Mr Ghanem are in any case very evasive ones.
Dr Ghanem's comments have sparked questions about Tony Blair's proposed visit to Libya.
BBC: NEWS | UK | Politics | Libyan PM denies country's guilt
The appointment last June of an American-educated economist, Shukri Ghanem, as prime minister marked a new seriousness about reform.
Shukri Ghanem told Radio 4's Today the Wpc Fletcher issue was "settled".
BBC: NEWS | UK | Politics | Libyan PM denies country's guilt
Among other things, it hires and fires both the prime minister and his cabinet, as Mr Ghanem has just found to his cost.
Ghanem's family said they believed that his organs had been removed.
Instead of hectoring speculators, perhaps Mr Lieberman should be hounding Mr Ghanem and the leaders of other oil-rich countries to allow foreign oil firms more access.
ECONOMIST: The price of oil is beyond $130 a barrel. Where will it stop?
Overall, however, Mr Ghanem's remarks are very much in line with Libya's previous tactics of putting up a smokescreen to hide the fundamental changes in its position.
"Now we were able to restore most of the oil fields and they are ready to produce but we need our work force to come back, " said Mr. Ghanem.
In other words, the investors that Messrs Lieberman and Ghanem accuse of unfounded speculation may instead have concluded that the world will be short of oil for some time to come.
ECONOMIST: The price of oil is beyond $130 a barrel. Where will it stop?
Meanwhile, Libyan Oil Minister Shukri Ghanem urged foreign oil companies to send back their workers and experts to Libya as soon as possible, saying that the situation in his country was returning to normal.
Mr. Ghanem suggested, however, that if foreign oil companies didn't send back their staff, who were evacuated at the start of the crisis last month, then Libya would be compelled to offer new oil concessions to other companies from Brazil, China and India in order to restore production and exports to their previous levels.
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