Sir Michael Palin believes his good friend and fellow Monty Python star Terry Jones no longer recognises him.
The Monty Python stars continue to see each other following Jones' dementia diagnosis, which left him unable to communicate.
Sir Michael is now concerned that his long-time friend and co-star does not know who he is.
Speaking to the Daily Express, he said: The last time I saw him I don't think he recognised me.
"We knew each other well. It feels like a part of yourself isn't there any more."
In 2015, the Monty Python writer, director and actor was diagnosed with a form of dementia which affected his ability to communicate.
Sir Michael has said that despite the degeneration, his friend still finds moments of joy.
He said of his last visit: "At a certain moment Terry began to really laugh, the way he used to laugh. That was a great moment.