Martin Brundle has suggested Ferrari could find itself under scrutiny from the FIA after abnormal rear wing movement.
The SF-23 featured a single-pillared rear wing for the beginning of practice but with Charles Leclerc and Carlos Sainz at the wheel, the component wobbled with aggressive horizontal travel.
This forced the team into a reversion towards a double-pillar wing for the end of the session.
"The rear wing wobbling around on the Ferrari, I think the FIA technical police will want to have a look at that and understand – and check – that it has got integrity, to be honest, to stay on the car," Brundle told Sky Sports F1.
"That [the wobbling] is extraordinary. No wonder they were working around the back of that [the car].
"That doesn't look like it will survive anything like a grand prix, [does] it?"
Sainz returned to the circuit with the old version of the wing but spun at turn nine, hitting an aggressive bump and rotating at high speed to ruin a set of medium tyres.
"He was a little bit greedy on the kerb on the way in and a touch wide," assessed Brundle.
"But the disturbing thing there, if I was driving that, I would be very concerned about how quickly it unloaded, the tyre and the aero.
"He was a total passenger from the moment it ran out of travel on the bump."