Bad Company guitarist and songwriter Mick Ralphs is recovering in hospital after suffering a stroke.
The 72-year-old co-founder of the band is "receiving excellent medical care and is recovering in hospital", his family said.
The band returned for their swansong tour this October, which saw them visit eight cities in the UK and original members Paul Rodgers and Simon Kirke joining Ralphs on stage.
A statement said: "Following the Bad Company UK tour that wound up last Saturday at London's 02 Arena, the family and representatives of the band's co-founder, guitarist and songwriter Mick Ralphs are sad to announce that Mick has suffered a stroke.
"Mick is receiving excellent medical care and is recovering in hospital, although all his public engagements are necessarily on hold, pending his improvement."
"Everyone is wishing Mick a speedy recovery, and further news will be announced at the appropriate time."
The band was formed in 1973 after the members of the bands Free, Mott The Hoople and King Crimson decided to join forces.
Free members Rodgers and Kirke had enjoyed success with their 1970s hit song All Right Now.
Ralphs had been part of Mott The Hoople, famed for their 1972 song All The Young Dudes, which was penned by David Bowie.
Vocalist and guitarist Raymond "Boz" Burrell had been performing as part of rock band King Crimson.