The Succession star, 77, told the BBC he liked dancing but was not sure he wanted “to go down that road”.
More than eight million people viewed Saturday’s grand final of the dance competition on BBC One.
Actress Ellie Leach, 22, was crowned this year’s champion, making her the youngest winner in the show’s history.
The Coronation Street actress, partnered by professional dancer Vito Coppola, beat EastEnders’ Bobby Brazier and Bad Education star Layton Williams to lift the glitterball trophy.
With an average age of 23, they were the youngest trio of finalists ever to compete.