"That plan, of course, had been thrown into disarray by them being declared suspects. They have been clarifying their position and they have been told they are allowed to go. It appears a deal has been struck - the authorities are satisfied that Kate and Gerry McCann will return to Portugal if required," he said.
The McCanns' spokesman confirmed the plans in a statement, saying: "Kate and Gerry will be returning home to the UK this morning as originally planned. They will depart from Faro Airport. It is emphasised that their return is with the full agreement of the Portuguese authorities and police."
The McCanns have no bail conditions attached to their arguido, or formal suspect, status and retain their passports.
Earlier, Madeleine's aunt said the couple had been worried that a return would appear that they are running scared.Philomena McCann, who spoke to her brother Gerry after he was questioned by detectives, said: "(Gerry) doesn't want it to look as if they are running away, because that is nonsense."