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"Don't believe those who say that it's not going to happen and that people in the UK have realised their error... I don't think that's going to be the case," he told a Brussels conference.
The EU budget commissioner said the UK's departure would leave a hole of about €12-13bn (£11-12bn; $14-$16bn).
Budget Commissioner Günther Oettinger said the budget gap would have to be closed with 50% spending cuts and 50% fresh money. He suggested a Europe-wide tax on plastic products as a source of extra revenue.
The Commission will publish a proposal in May this year and has urged EU leaders to agree a budget deal by May 2019. [...]