Chelsea played Reading last week and lost both GKs (the primary one and the backup) to terrible head injuries. Say what you want about Chel$ki, you never want to see this happen on a pitch.
The first GK, Petr Cech, gets accidentally kicked in the head. He suffered a depressed skull fracture and will be out for about 6 months. The backup keeper then gets WRECKED and sustains a concussion himself.