sentences:  In September 2006, Marco Giampaolo was involved in a freak training ground accident, the 39-year-old boss was hit on the head by a wayward ball and, despite continuing with the training session, developed symptoms of concussion soon after.The coach was taken to hospital as a precautionary measure.On 17 December 2006, after a 3–1 away defeat to Udinese in a league match, Cagliari boss Massimo Cellino announced to have sacked Giampaolo, citing coach's loss of confidence with the team.