Keegan’s family had revealed in January the former England, Liverpool and Newcastle player had been diagnosed with cancer.
And the 75-year-old provided an update on his health during an appearance at the Tyne Theatre and Opera House over the weekend.
“They said we have a top doctor with this new way of fighting what you have got, which is stage four cancer,” said Keegan, in quotes first reported by the Daily Mail today.
“He was a Liverpool supporter so I went to meet him. I knew I wouldn’t be walking alone, if you know what I mean.”
Speaking at the event, Keegan also said he would like to return to St James’ Park for what would be a hugely emotional farewell.
He said: “I want to say goodbye. I didn’t get the chance when I left the club last time.”
Newcastle sent their best wishes to Keegan in a post on X on Monday, saying the former England boss will "always be warmly welcomed" at St James' Park.
The club said: “We send our heartfelt support and warmest wishes to Kevin Keegan and his family following his recent diagnosis of stage four cancer.
“Kevin holds a unique and cherished place in the history of Newcastle, and in the hearts of our supporters. His passion, leadership and connection to the club and city have shaped some of our most memorable moments.
“Everyone at the club is behind Kevin and sends strength and best wishes to him and his family for the journey ahead. Kevin will always be warmly welcomed at St James’ Park and we hope to see him again soon.”
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Keegan made 78 league appearances for Newcastle at the end of his career before returning as boss in 1992 for an unforgettable spell in the dugout.
The Entertainers were born under Keegan, with Newcastle coming agonisingly close to winning the Premier League title in the 1995/96 season.
He had a spell as Fulham boss before becoming England manager in 1999 but, after overseeing a disappointing Euro 2000 campaign, Keegan resigned following a World Cup qualifying defeat to Germany.
Keegan then took charge at Manchester City before leaving in March 2005 and made a return to Newcastle in 2008 for a short second stint in charge.
As a player, Keegan began his career with Scunthorpe and was signed by Liverpool in 1971, winning the First Division three times along with two UEFA Cups, the FA Cup and the 1977 European Cup.
He won the Ballon d’Or – then called the European Footballer of the Year – twice while at German side Hamburg, where he featured in another European Cup final, and played for Southampton and Newcastle before retiring in 1984.
On the international stage, he scored 21 goals in 63 England appearances and played at the 1982 World Cup finals.