Matsuda was involved in a high-speed accident at 130R on lap 59 of 77 in the 450km race last Sunday that left the #23 NISMO Nissan Z almost completely destroyed.
The 43-year-old was transferred to hospital by air, but Nissan announced that he had escaped any serious injuries that evening.
On Wednesday, Matsuda updated his social media for the first time since the accident to say that he had left the intensive care unit he had been kept in, although he remains in hospital
He wrote on Twitter: “Today, I moved from the ICU to the hospital ward and am able to send messages again.
“I apologise for the great concern I have caused this time.
“I am now working hard on my rehabilitation in order to be well again and to be able to race again as soon as possible. Thank you for your continued support.”
Source: Autosport