Materials have been sent for testing in Germany following a three-day search of Arade Dam in Portugal, about 50km inland from the beach resort where Madeleine McCann disappeared while on a family holiday in 2007.
Authorities searched two heavily wooded areas near the bank of the dam, leaving behind several holes.
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Police from three countries were involved in the search, erecting two tents beside the dam on Monday.
They cleared vegetation from the wooded areas before raking through the soil, and sending in sniffer dogs after this was done.
Bags of evidence were later seen being removed from the site.
The possible new evidence comes after German authorities last year formally identified German man Christian Brueckner as an official suspect in the disappearance of the British girl.
Brueckner, a convicted child abuser and drug dealer serving jail time in Germany, regularly visited the Arade Dam area around the time of Madeleine’s disappearance.
7NEWS understands police were searching for items including Madeleine’s pyjamas, a camcorder and a gun belonging to Brueckner.
It is understood some of Brueckner’s associates may have stolen the items and left them near the dam.
The camcorder may contain video that could tie Brueckner to a number of sexual assaults and possibly Madeleine’s disappearance.
Soil samples have been taken to Germany, where they will be forensically tested.
The German prosecutor said they will announce if the samples contain anything of note as soon as this is evident.
Brueckner has denied any involvement with Madeleine’s disappearance and has not been charged with any crime related to it.
A German court last month found that German prosecutors did not have jurisdiction in relation to sexual offences he allegedly committed in Portugal between 2000 and 2017.
He was previously convicted of a rape in Portugal in 2005.
The Braunschweig state court denied responsibility for the new charges against Brueckner, due to disputed evidence about his last-known address in Germany.
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