Bryan Herta Autosport will miss today's IndyCar race at Pocono as a consequence of Jack Hawksworth's heavy crash in practice yesterday.
The 23-year-old rookie was beginning a qualifying simulation when he lost control in Turn 1 and made heavy contact with the outside wall.
He was taken to the infield medical centre and then to the nearby Lehigh Valley Health Network in nearby Allentown, where he spent the night.
The series confirmed on Sunday morning that he had been diagnosed with a myocardial contusion and had been refused clearance to drive, with a further medical assessment scheduled before he can be given the green light for next weekend's race at Iowa.
For the team, the setback caused by Hawksworth's medical condition was compounded by the damage to his car.
AUTOSPORT understands that the tub was cracked in the impact, and team sources confirmed that there are no plans to attempt to prepare the spare car and seek an 11th-hour replacement driver.
Sources suggest that the impact was measured at 100G.