Portuguese investigators seeking to re-interview friends of Madeleine McCann's parents, from Leicestershire, are in contact with the UK authorities via an intermediary.
Portuguese police seeking to re-interview the "Tapas Seven" are reportedly in contact with the British authorities via Eurojust.
They are understood to be poised to fly to the UK to sit in on fresh questioning of the friends by British police.
The seven were on holiday in Praia da Luz in the Algarve with Kate and Gerry McCann when their daughter vanished last year.
The Portuguese public prosecutor contacted Eurojust - the European Union's judici
al co-operation agency - at the start of January.
Its spokesman, Joannes Thuy, said on Tuesday: "I can confirm that Eurojust was asked to be the go-between for the Portuguese and the UK authorities."
Eurojust, based in The Hague, Holland, was formed in 2002 and is made up of 27 prosecutors and judges, one from each of the EU's member states.
Its role is to help European investigators and prosecutors exchange requests for information and assistance in cases of serious crime involving more than one country.
Mr and Mrs McCann, from Rothley, have been named "arguidos", or formal suspects, in Madeleine's disappearance, but they strenuously protest their innocence.
Their spokesman said on Monday that the couple expected the police files on Madeleine's disappearance to remain secret for another three months.
Copyright (c) Press Association Ltd. 2008, All Rights Reserved.
The full article contains 250 words and appears in Press Association newspaper.