"We are investigating the facts and are launching a military police inquiry".
He was arrested on Tuesday after the Brazilian military plane he was travelling in made a stopover in Seville in southwestern Spain on its way to Japan, said a spokeswoman for Spain's Guardia Civil police force.
'Obviously, given the quantity of the drug he was carrying, he didn't buy it on the corner and bring it, right?' said Mourao.
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Also in a statement on Wednesday, the country's Vice-President, Hamilton Mourao, described the officer as a qualified drug mule.
The unnamed airman was on a back-up plane believed to have been carrying members of Mr Bolsonaro's security team, with the Brazilian leader heading towards Japan on another aircraft.
He said if the officer is found guilty, he would "be judged and convicted by law".
Brazilian and Spanish media have reported the arrest of 38-year-old sergeant Manuel Silva Rodriguez.
He called the airman a "well-qualified (drug) mule". At the time of filing this report, he was still with the Spanish authorities.