Earlier, Red Bull official Dr Helmut Marko said “incriminating” video footage of flexible aerodynamic features of the red car is doing the rounds.
But Niki Lauda, the team chairman at Mercedes, played down the rumours as “nonsense”.
“If someone believes it is illegal, all cars go through technical inspections,” the F1 legend told German television RTL.
The flexible parts of the Ferrari most under scrutiny are the front wing flaps, the rear wing and the ‘monkey seat’.
But some believe the biggest advantage is being achieved through the floor.
Former F1 driver turned pundit Marc Surer, however, told Germany’s Sky: “It is legal.
“Ferrari has cleverly used a gap in the rules.”
And so for now, while Marko is among the naysayers, there is no sign of an official protest.
“Nothing is coming from us,” he said. “The FIA are the police.”
— ThisisF1 (@ThisisF1) April 17, 2017
According to German publication Auto Motor und Sport, the focus is on a ‘Ferrari flex’ story linked to the red car’s floor.
An unnamed engineer is quoted as saying: “There are slow motion recordings of Raikkonen in testing, when the floor actually bends downwards at the sides.”
Others are less doubtful, saying Ferrari’s performance surge in 2017 is entirely legitimate.
“This is not just about the car or the engine, but the whole,” said Gunther Steiner, boss of small Ferrari-linked American team Haas.
“Ferrari started developing the car early last season — earlier than Mercedes,” he told Auto Bild.
“And Mattia Binotto is a very, very good technical manager who had a consistent plan from the outset.”