Justin Wilson remains in a coma after suffering a severe head injury during Sunday's IndyCar race at Pocono.
The Briton was hit in the head by a piece of flying debris that had come off Sage Karam's car when the American hit the wall in the closing stages.
Wilson is believed to have been knocked unconscious by the debris and then careened into the inside wall.
After being airlifted to the Lehigh Valley Health Network Cedar Crest Hospital in Allentown, it was announced that he was in a critical condition.
IndyCar officials released a medical update on Monday that stated his condition was unchanged.
It said: "Verizon IndyCar Series driver Justin Wilson remains hospitalized in a coma in the intensive care unit at Lehigh Valley Health Network Cedar Crest Hospital in Allentown, Pa., after sustaining a severe head injury during Sunday's event at Pocono Raceway. He remains in critical condition.
"INDYCAR continues to send its thoughts and prayers to the family and thanks the entire motorsports community for the outpouring of support."
Several drivers from around the world took to social media in support of Wilson with three-time NASCAR Sprint Cup champion Tony Stewart lending his plane to the family of Wilson to fly to Pennsylvania.