Former Chelsea winger Paul Canoville is critically ill in hospital after emergency surgery.
The 58-year-old was the club's first black player when he signed in 1981 and scored 15 goals in 103 games before retiring with a knee injury aged 25.
Canoville runs his own foundation and has been a prominent anti-racism campaigner.
The Blues have wished him a rapid recovery, saying he "holds a major place in Chelsea history".
A statement from the Paul Canoville Foundation asked people to keep him in their thoughts.
"We are sad to advise that our founder Paul Canoville is critically ill in hospital after complications set in after emergency surgery," it said.