The outspoken Austrian had been asked about the latest Red Bull saga, amid reports the FIA told the team to remove an illegal hand-control for adjusting the RB8's ride height without a tool at June's Canadian Grand Prix.
The website of Italian sports newspapers Tuttosport and Corriere dello Sport said Ferrari has responded to Marko's claims by issuing a robust denial.
A Ferrari spokesman was quoted as saying the accusation is "completely untrue".
"One has to wonder how an outsider could have seen something like that," said the Auto Motor und Sport writer.
"Chassis components at the front are well hidden in the carbon tube, and you can only get access to them from the top service hatch.
"And it's hard to imagine Ferrari would have given any insight to strangers," added Schmidt.