The 69-year-old former midfielder made 329 appearances for Liverpool between 1974 and 1982 and 23 appearances for England.
McDermott is in the early stages of dementia with Lewy bodies.
McDermott said: “I have to stick to it, I will. This is how I grew up. Nothing is easy for me. I am not afraid to accept it, and, as we have seen, there are many The former player’s condition is worse than mine.
“Fighting is second nature. The worst thing is that you don’t know what happened until my condition is diagnosed. The number of former players who have been diagnosed with dementia or Alzheimer’s is frightening. .”
On Saturday, McDermott attended Anfield and Liverpool defeated Burnley in front of the first audience in 18 months.
“I have been looking forward to going to Anfield to see the guys, people I have known for many years, and having fun with them,” he said.
“Fortunately, now I can participate in some competitions on a regular basis.”
