David Suchet has said he gives his blessing to whoever goes on to play Poirot next.
But David said: "There will be another Poirot, of course there will.
"And if I'm alive, I look forward to encouraging him, exactly the same way as another great actor encouraged me - Peter Ustinov. He said, 'You'd make a much better Poirot than I ever will, because you could look like him'."
David appeared as Inspector Japp opposite Peter Ustinov as Poirot in a 1985 TV film of Thirteen At Dinner.
It was recently revealed that crime novelist Sophie Hannah has been commissioned to write a new Poirot novel, but despite his attachment to the role, David is not keen to reprise it for the new adventure.
"I don't see how I can revive myself for a story that is not Agatha Christie," he said.
"However, I'd love to do a remake of one of the stories for a movie. I would love to do The ABC Murders, which is my favourite. There's nothing to stop me reprising the story for cinema, because I've never done a cinema Poirot."
After 25 years David is a devoted fan of the late Agatha Christie's work - but he is still not sure he would have liked to have met her in person.
"The first time I had any idea that she would have been pleased - and I was very nervous because she hated her characters being shown on television - was when the late Rosalind Hicks, her daughter, said to me, 'I think my mother would have been delighted'. That, coming from her, was quite something.
"Would I like to meet her now? I think I'd still be frightened. Just in case..."
:: Curtain: Poirot's Last Case is on ITV on Wednesday, November 13.