Lord Attenborough is in a stable condition after an accident at home, a hospital spokesman has said.
The 85-year-old actor and director had to pull out of a ceremony in honour of Brief Encounter actress Celia Johnson on Thursday after suffering a fall, BBC reported.
He had been due to unveil an English Heritage blue plaque at her former home in Richmond-upon-Thames, Surrey, where Lord Attenborough also lives.
He is recovering in St George's Hospital in Tooting, south-west London.