British police are reportedly set to release an e-fit of a possible Madeleine McCann suspect.
According to Sky News, British detectives investigating Madeleine's disappearance are to issue the picture but Scotland Yard would neither confirm nor deny the claim.
In a statement, the Metropolitan Police said: "We are not prepared to discuss, comment or speculate on the content of the upcoming appeal in relation to the investigation into the disappearance of Madeleine McCann.
"This has been weeks in the planning and each element of the investigation must be set into the overall context of the appeal.
Kate and Gerry McCann are due to launch a new appeal for information
"We will be asking for help from the public in a number of countries, delivered through a series of public appeals.
"We will do nothing to jeopardise the effectiveness of these appeals and we have repeatedly stated that media speculation can be damaging to our efforts.
"The MPS will release the relevant material at the relevant time."
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Madeleine disappeared from her family's holiday apartment in Praia da Luz in the Algarve on May 3 2007 as her parents dined at a nearby restaurant with friends.
British detectives launched a fresh investigation in July this year - two years into a review of the case - and a new BBC Crimewatch appeal on the case is to be aired on Monday.
The appeal will include a reconstruction of the "latest, most detailed understanding" of the events around the time Madeleine went missing.
Scotland Yard has revealed a vast log of mobile phone traffic could be the key to finding out what happened to the girl.
Madeleine's parents have said they remain "optimistic" of finding their daughter and will not accept she is dead until they are presented with clear evidence.
The Metropolitan Police now has a team of six Portuguese detectives based in Faro who are carrying out inquiries on its behalf.
The Portuguese investigation is officially closed but authorities there are backing the Scotland Yard inquiry and officers from both countries will work together in pursuing new leads.