Brexit Secretary Stephen Barclay and senior government officials are due to discuss alternative arrangements to the Irish backstop.
The Alternative Arrangements Working Group will meet for the first time on Monday after MPs voted to find another way of avoiding a hard Irish border.
Home Secretary Sajid Javid has already said that “existing technology” could be used.
The Irish PM said the UK was reviewing ideas that had “already been rejected”.
Leo Varadkar told RTE radio it was “very