James Hinchcliffe will remain on the sidelines for at least the next two days as he continues to recover from a concussion sustained in Saturday's Indianapolis road course IndyCar race.
The Andretti driver was taken to hospital after being struck in the helmet by debris. His condition was confirmed by CT scans on his head and neck.
Hinchcliffe was released from hospital on Saturday evening, but will not be allowed to return to the cockpit until passing an additional medical evaluation.
The injury ruled Hinchcliffe out of the opening days of practice for the Indianapolis 500, although the Canadian did make a brief visit to the track on Sunday to meet with his crew.
According to Andretti Autosport he could return to the track for a re-evaluation as early as Tuesday, although no date has yet been set for his next medical visit.
EJ Viso has been charged with standing in for Hinchcliffe in the meantime.
The Venezuelan completed a 26-lap shakedown of the car on Sunday, finishing up with the sixth-fastest speed of the day.