EFL legend Ronnie Moore has unfortunately been diagnosed with an incurable form of blood cancer.
Moore, 72, managed a large number of English clubs, including Tranmere, Oldham and Rotherham and Hartlepool.
He is currently the most important explorer at the latter, a role in which he has been sitting since April last year.
Moore was a striker before hung up his boots and turned to coaching, play for Tranmere and Rotherham and Charlton, Cardiff and Rochdale.
Rotherham announced the devastating news on social media on Wednesday and posts on X: 'We are right with you, Ronnie.
“The thoughts and relentless support of everyone at Rotherham United is with the legendary former player and manager@Ronnemoore53 who has been diagnosed with myeloma – a form of blood cancer.”
The Englishman will receive treatment in the coming months, including a stem cell transplant, but there is no hope for a complete and total recovery.
A myeloma is generally considered treatable, but cannot be cured, with treatment aimed at controlling the disease, relieving symptoms and extending life.
A longer statement on the Rotherham website was: 'We have been informed that Ronnie will now be treated in the coming months and he will wait for a stem cell transplant for a cancer that can be treated, but unfortunately incurable and will have to be managed by medical professionals.
'We are happy to hear that Ronnie is currently feeling good and walks regularly.
'A real legend of the football club, Ronnie remains welcome to attend matches in Aesseal New York Stadium and will of course have the full support of everyone at Rotherham United during the trip that lies in front of us.
'We know that our fan base and the wider football family will join us to offer our unambiguous support to an immeasurably respected and right-won-controlled person and we are convinced that this will be done in a way that respects the privacy of Ronnie, his family and his friends. We are good with you, Ronnie. '
Moore is considered one of the biggest Rotherham players of all time with 52 goals in 125 games.