The informal summit is expected to focus on the distribution of key EU posts following the election, including that of president of the European Commission, the bloc's executive body.

Speaking ahead of the meeting, Bratušek said the EU should be concerned by the low turnout and rise in euroscepticism expressed in the vote. For this reason it needs leaders who have broad support and a solid majority to steer it in the right direction, she added.

The post of Commission president is being contested by Jean-Claude Juncker of the European People's Party (EPP), which won the most seats in the European Parliament, and Martin Schulz of the second-placed Socialist & Democrats (S&D) group.

Neither group has a majority by itself and talks are underway for a solution, with Juncker reportedly to be given the first shot to secure backing.

While he has already received expressions of support from a number of leaders belonging to the S&D camp, he faces opposition from a section of the conservative camp, led by British Prime Minister David Cameron.

Cameron is reported to have reached out to a number of countries in his effort to prevent Juncker from becoming Commission president, including Slovenia.

Quizzed about support for Juncker, Bratušek told reporters that Slovenia would be willing to back the former eurozone chief if he were able to secure broad support in the EU.

Confirming that she had been in contact with Cameron ahead of the summit, the prime minister said that in the talks she made the call for a woman to get one of the key EU posts.

She added that the dinner meeting in Brussels was informal in nature and that concrete decisions should not be expected.

Asked about who the government would propose as the Slovenian member of the European Commission, Bratušek responded: "This is not an issue for today and there will be time for this."