Sir Bruce Forsyth is recovering at home after being admitted to hospital following a fall.
The 87-year-old TV presenter's injuries means he has had to pull out of hosting his planned variety show Bruce's Hall of Fame, The Mirror reports.
Forsyth was due to present the show alongside Pointless presenter Alexander Armstrong, who will now take over the role of compere in Forsyth's absence.
In a statement, Kalooki Pictures, the company behind the variety show, said: "This morning, Sir Bruce Forsyth slipped and fell at his home resulting in facial abrasions and minor concussion.
"He attended hospital and had a series of scans and tests all of which happily proved negative.
"However, because of his injury, he has been told by doctors he must have complete rest for at least seven days."
Speaking after his fall, Forsyth added: "I was really looking forward to this show and working with such a talented cast, and I am really sad not to be part of it.
"It is now in the most capable hands of Alexander Armstrong and I would like to wish him, the guests and the whole production team good luck on Sunday."
It was recently revealed that Forsyth was returning to Strictly Come Dancing for the show's festive special later this year.
Bruce's Hall Of Fame is expected to air on the BBC next year.
It's no laughing matter at Bruce's age, a fall can eventually be fatal.
