The question of how to get Libyan oil from rebel areas back on world markets is to be explored at an international meeting next month.
Sanctions intended to constrain Colonel Gaddafi have prevented rebels from selling oil to raise funds.
Italy is pushing efforts to bring about sales from eastern Libya.
In Rome the Italian foreign minister pledged his support at a meeting with the head of the main Libyan rebel council.
So far, rebels have only been able to export small quantities of oil with the help of Qatar, which along with Italy and France was among the first to recognise the council.
Its leader Mustafa Abdel Jalil said a future rebel government would uphold all existing treaties and commercial agreements with foreign partners.
The Libya contact group will meet in Rome in early May.