"I was taking the medical exams and I had a cardiorespiratory arrest," Doni told Globoesporte.com. "I was unconscious for 25 seconds and almost went 'to the other side'.
"After that, I went to London and had several exams that confirmed I didn't have any sequels. Then they sent me back to Rome, where one of the finest doctors in Europe took care of me.
"I was really down for three months, I had trouble sleeping. Anyone who's gone through that knows what a horrible feeling it is.
"You end up giving more value to life, to your family, your kids, you just want to stay close to your family. Then you stop, think and you realize what are the real important things in life."
Liverpool signed Doni from Roma in summer 2011.