The 69-year-old former midfielder made 329 appearances for Liverpool between 1974 and 1982, and earned 23 caps for England
McDermott is in the early stages of Lewy Body dementia.
McDermott said: “I’ve got to get on with it and I will. It’s the way I’ve been brought up. Nothing has come to me easily. I’m not frightened of taking it on and also, as we’ve seen, there are a lot of former players in a worse state than me.
“Battling is second nature. The worst thing was, until my condition was diagnosed you don’t know what’s going on. The number of ex-players being diagnosed with dementia or Alzheimer’s is frightening.”
McDermott was in attendance at Anfield on Saturday as Liverpool beat Burnley in front of a first capacity crowd in 18 months.
“I’ve been looking forward to going down to Anfield and seeing the lads, people I have known for years and having a good craic with them,” he said.
“Thankfully there are games coming up regularly now which I can go to.”