Vergne's car snapped into a high-speed spin on the approach to the Rettifilo chicane on lap nine, and was launched into the air over the kerbs.
"I was taken from the accident to the medical centre, but apart from a bit of pain in my back and my head, I am fine," said Vergne, who was running 16th at the time.
The team said it currently did not know what caused the crash, which Vergne said left him baffled but relieved.
"I don't know why I crashed," he said.
"All I can remember is that when I braked, I completely lost control of the back end of the car.
"I felt a big impact when the car landed after going up in the air.
"The kerb is high at that point and I count myself lucky that the car did not flip over."