EU Commission President Jean-Claude Juncker said the UK should make its position on Brexit clear as soon as possible.

His comments, at the opening of the European Parliament session dedicated to the UK's prospective withdrawal from the EU, came as British Prime Minister David Cameron was to meet leaders of member states for the first time since Thursday's referendum in his country.

Juncker on Tuesday made clear neither official nor unofficial talks would be conducted with the UK on that matter before it triggered Article EU of the Lisbon Treaty, thus clearly stating its intention to withdraw.

Cameron, however, said after referendum results were announced that he would leave it up to his successor to deal with the withdrawal and announced he was stepping down in a few months.

London made clear it was not mandatory for it to immediately trigger Article 50. Other EU powerhouses earlier warned they would like the procedure to begin as soon as possible to avoid months of limbo.

A two-day summit dedicated to Brexit is due on Tuesday and Wednesday, with the second day bringing together leaders of all the remaining (Britain excluded) 27 member states.

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