The British investigation into Madeleine McCann's disappearance will finish in the next few months unless new evidence emerges, police have said.
A small team of officers are following one remaining line of inquiry into the three-year-old's disappearance while on holiday with her parents in Portugal in 2007.
They have been granted £95,000 Home Office funding to keep the probe going for another few months.
Scotland Yard boss Sir Bernard Hogan-Howe, speaking on LBC, said the remaining line of inquiry is one that "everybody agrees is worthwhile pursuing."
The investigating team, which began in 2011, has been reduced from 30 to three in recent years.
During the probe, named Operation Grange, detectives highlighted a sex offender who had targeted British families with young children staying in villas in the same area where Madeleine was last seen.
Sir Bernard said "a missing child inquiry is never closed" but the current probe will conclude if the remaining line of inquiry does not prove fruitful.
Last week Detective Chief Superintendent Mick Duthie, who is head of the force's murder squad, said there was a "possibility" Madeleine could be found alive.
"There is ongoing work," he said. "There is always a possibility that we will find Madeleine and we hope that we will find her alive."