Updated

When Dario Franchitti made a rare phone call from Scotland to his boss, Chip Ganassi knew immediately something was off with the driver.

He could hear the heartbreak in Franchitti's voice and quickly asked him what was wrong.

Franchitti delivered the difficult news: Doctors had told him it was too dangerous to continue racing because of injuries sustained in a crash last month. The three-time Indianapolis 500 winner was reluctantly retiring.

Ganassi said Franchitti will recover completely from his injuries, which included a fractured back, broken ankle and a concussion. Ganassi said the threat of another concussion put Franchitti at too great a risk to continue racing.

Now the team owner begins a search for a new driver for the iconic No. 10 Target car.