The little girl went missing from a holiday apartment in Portugal in 2007 when she was three, and despite efforts by police there and a British investigation launched in 2011, no progress has been made in finding her.
However, Detective Chief Superintendent Mick Duthie told the Evening Standard that Scotland Yard’s probe is “ongoing” and officers hope to find her alive.
In April, Britain’s Home Office granted the investigation, called Operation Grange, £95,000 (€119.5m) to cover another six months of the inquiry.
This came after the number of officers working on the operation was scaled down from 29 to four in October 2015.
Mr Duthie, who is head of Scotland Yard’s Homicide and Major Crime Command, said: “There is ongoing work. There is always a possibility that we will find Madeleine and we hope that we will find her alive.
“That’s what we want and that’s what the family and the public want and that is why the Home Office continue to fund it. There is work that needs to be done still.”
He told the newspaper that the team will go to the Home Office and ask for more money if they have not finished their inquiries within six months.
Mr Duthie said: “There is a missing girl and if she has been murdered and if we think we have got justifiable and reasonable lines of inquiry to pursue then they should be dealt with.”
On May 3, it will be nine years since Madeleine went missing.