Former England midfielder Ray Wilkins is "critically ill'' after suffering a cardiac arrest.
"Ray Wilkins is currently being treated at St George's Hospital, and his condition is critical," the hospital said on its official twitter feed on Saturday. "His family have asked for privacy at this time, and we are tweeting this update with their agreement."
His wife Jackie Wilkins told the Daily Mirror that the 61-year-old ex-Chelsea, Manchester United and AC Milan player fell in the wake of the cardiac arrest.
"He's in hospital, he's had a cardiac arrest and is in intensive care,'' the newspaper quoted her as saying. "He's not in a good state at all, I'm afraid. He's critically ill.
"The cardiac arrest led to a fall which has meant he's had to be put in an induced coma. It's very, very bad.''
The thoughts of everybody at Chelsea Football Club are with Ray Wilkins and his family tonight. Keep fighting Ray, you have our love and support. pic.twitter.com/egOapZhDYN
— Chelsea FC (@ChelseaFC) March 30, 2018
Wilkins had carried out media duties on Talk Sport and Sky Sports -- he is a regular on both platforms -- shortly before.
A winner of 84 England caps, Wilkins -- known in the game as "Butch" -- played for 12 sides and was on the coaching staff of several more, but is commonly associated with Chelsea.
He started his career there and spent six years with the Blues, while also having numerous stints as assistant manager. On one occasion, he led the side on a caretaker basis.
Carlo Ancelotti, under whom Wilkins worked at Stamford Bridge, once described him as having "real blue blood."
Following the reports Chelsea tweeted: "The thoughts of everybody at Chelsea Football Club are with Ray Wilkins and his family tonight. Keep fighting Ray, you have our love and support.''
During his career as a player, he won the FA Cup with Manchester United in 1983 and the Scottish title with Rangers in 1989.
Former club Leyton Orient sent Wilkins their best wishes on Twitter, writing: "Everyone associated with LOFC's thoughts are with former player Ray Wilkins and his family tonight. Keep fighting.''
Wilkins is a regular on the Alan Brazil breakfast show on Talk Sport and a message on the show's Twitter account read: "Ray Wilkins is one of the nicest men you could ever wish to meet and working with him on the show is always a joy. Keep fighting, Butch. From Alan & everyone at @talkSPORT.''