European Union countries are preparing possible sanctions against officials in Libya blamed for undermining the peace process and blocking the formation of a unity government.

EU diplomats say that a small list of "spoilers" could be targeted as soon as next week.

The diplomats declined to be named because the process is sensitive and ongoing.

Unconfirmed reports suggest Nouri Abu-Sahmain, head of Tripoli parliament, and Khalifa Ghweil, prime minister of Tripoli Salvation government, could be in the EU's sights.

Libya has been split between rival governments since 2014, a consequence of the chaos that engulfed the country after a 2011 uprising that toppled and killed longtime dictator Moammar Gadhafi.

EU foreign ministers will hold informal talks on Libya in Brussels on Monday.