Former Liverpool and Scotland centre-back Alan Hansen, 68, is “seriously ill”.
The Anfield club announced their “legendary” former captain is in hospital on Sunday.
“The thoughts and support of everyone at Liverpool FC are with our legendary former captain Alan Hansen, who is currently seriously ill in hospital,” a statement read.
Hansen won promotion to the Scottish Premier Division with Partick Thistle before joining Liverpool in 1977 for the start of a successful 14-year spell.
He was a key part of the great Reds teams of the 1970s and 1980s, winning eight First Division titles, three European Cups and two FA Cups.
The Premier League side added they are “currently in contact with Alan’s family to provide our support at this difficult time, and our thoughts, wishes and hopes are with Alan and all of the Hansen family”.
Hansen, who also won four League Cups with Liverpool, appeared 26 times for his country and was a member of Scotland’s 1982 World Cup side.
After retiring in 1991, he appeared as a pundit on Match of the Day from 1992 until 2014.
Hansen’s former Match of the Day colleague Gary Lineker wrote on X: “Horrendous news. Thoughts are with Alan, Janet and all the family.”