He said more work was needed to identify the source of the virus.
Dr Embarek told a press conference that the investigation had uncovered new information but had not dramatically changed the picture of the outbreak.
Experts believe the virus is likely to have originated in animals, before spreading to humans, but they are not sure how.
It was unlikely that the expert group, in its politically-charged mission, would be able to pinpoint the source of the pandemic in China a year after it began. But, after visiting the Wuhan Institute of Virology, they have closed the lid on a controversial theory that coronavirus came from a lab leak or was made by scientists.
Their search for clues also included a visit to the now-famous wet market in Huanan – selling fish, meat and live wild animals – that was linked to some of the first human cases.
The team say the virus may have jumped from animals to humans, but they don’t have the proof yet.
Possible carriers include bats and pangolins, but tests so far have yet to find convincing evidence for this. Another line of investigation is whether the virus could have spread through imported frozen food. The hunt for the origin will continue.