Former Scotland, Manchester United and Leeds defender Gordon McQueen has been diagnosed with vascular dementia, his family have confirmed.
Several former players have battled the condition, prompting the Football Association to support two ongoing research studies examining ex-professionals for early signs of neurocognitive degeneration.
England World Cup winners Nobby Stiles, Jack Charlton, Ray Wilson and Martin Peters are among those to have died from the disease.
Here the PA news agency takes a look at some of the former players known to be battling dementia.
Jimmy Calderwood, 65
Sir Bobby Charlton, 83
Chris Chilton, 77
Gordon Cowans, 62
Chris Nicholl, 74
Gordon McQueen, 68
Jimmy Millar, 86
The family of former Rangers striker Jimmy Millar went public with his diagnosis in May 2017, by which point he had already been suffering with it for a decade. Millar scored 162 goals for the Ibrox club, forming a famous partnership with Ralph Brand.
Ernie Moss, 71
Moss made more than 500 appearances with his hometown club Chesterfield across three spells, scoring a record 191 goals. In a career lasting more than two decades he clocked up 749 league appearances with 10 different clubs, earning him a place in the Football League’s top 20 all-time list. Last year his family revealed Moss has been diagnosed with a rare form of dementia called Pick’s Disease.