Spanish police say “all the evidence so far” shows Diogo Jota was driving the vehicle which crashed last week, killing the Liverpool footballer and his brother.
Authorities said they also believe evidence is pointing towards the vehicle “significantly exceeding the speed limit for the highway”.
The accident happened at 12.30am local time on Thursday (11.30pm Wednesday BST) on the A-52 motorway in the municipality of Cernadilla, Zamora.
The report is being prepared and finalised.
“Among other things, the marks left by one of the vehicle’s wheels are being examined,” the statement from the Civil Guard in Zamora added.
Authorities said the report is not yet complete would “be submitted to the Puebla de Sanabria court”.
The 28-year-old Portuguese forward died in the accident in northwestern Spain.
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His brother, Andre Silva, was also killed in the crash on the Rias Bajas Highway (A-52) near Palacios de Sanabria, heading towards Benavente.
Local media reported that the speed limit for the road is 120kph (74mph).
Pictures following the crash showed debris scattered along the side of the road, including what appeared to be charred parts of the vehicle.
Footballers, family and fans gathered for the funeral of the brothers in Portugal on Saturday.
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Jota’s wife Rute Cardoso, whom he had married just 11 days before the accident, and his parents were among those at the service at the Igreja Matriz de Gondomar church in the town of Gondomar near Porto.
Tributes poured in from around the world, with Sir Keir Starmer, Oasis and Cristiano Ronaldo among those who mourned the loss of the brothers.
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